NEWS
author wenzelm
Tue Jun 10 19:15:14 2008 +0200 (2008-06-10)
changeset 27122 63d92a5e3784
parent 27104 791607529f6d
child 27141 9bfcdb1905e1
permissions -rw-r--r--
proper news header;
methods case_tac and induct_tac now refer to usual declarations;
removed obsolete induct_tac and thm_induct_tac;
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Isabelle NEWS -- history user-relevant changes
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==============================================
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New in this Isabelle version
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----------------------------
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*** Pure ***
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* Command 'instance': attached definitions now longer accepted.
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INCOMPATIBILITY.
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* Keyword 'code_exception' now named 'code_abort'.  INCOMPATIBILITY.
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*** HOL ***
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* Methods "case_tac" and "induct_tac" now refer to the very same rule
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declarations as the structured Isar versions "cases" and "induct", cf.
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the corresponding "cases" and "induct" attributes.  INCOMPATIBILITY,
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in rare situations a different rule is selected --- notably nested
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tuple elimination instead of former prod.exhaust: use explicit
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(case_tac t rule: prod.exhaust) here.
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* Removed fact "case_split_thm", which duplicates "case_split".
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* Command 'rep_datatype': instead of theorem names the command now
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takes a list of terms denoting the constructors of the type to be
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represented as datatype.  The characteristic theorems have to be
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proven.  INCOMPATIBILITY.  Also observe that the following theorems
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have disappeared in favour of existing ones:
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    unit_induct                 ~> unit.induct
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    prod_induct                 ~> prod.induct
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    sum_induct                  ~> sum.induct
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    Suc_Suc_eq                  ~> nat.inject
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    Suc_not_Zero Zero_not_Suc   ~> nat.distinct
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* 'Least' operator now restricted to class 'order' (and subclasses).
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INCOMPATIBILITY.
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* Library/Nat_Infinity: added addition, numeral syntax and more
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instantiations for algebraic structures.  Removed some duplicate
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theorems.  Changes in simp rules.  INCOMPATIBILITY.
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New in Isabelle2008 (June 2008)
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-------------------------------
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*** General ***
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* The Isabelle/Isar Reference Manual (isar-ref) has been reorganized
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and updated, with formally checked references as hyperlinks.
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* Theory loader: use_thy (and similar operations) no longer set the
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implicit ML context, which was occasionally hard to predict and in
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conflict with concurrency.  INCOMPATIBILITY, use ML within Isar which
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provides a proper context already.
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* Theory loader: old-style ML proof scripts being *attached* to a thy
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file are no longer supported.  INCOMPATIBILITY, regular 'uses' and
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'use' within a theory file will do the job.
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* Name space merge now observes canonical order, i.e. the second space
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is inserted into the first one, while existing entries in the first
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space take precedence.  INCOMPATIBILITY in rare situations, may try to
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swap theory imports.
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* Syntax: symbol \<chi> is now considered a letter.  Potential
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INCOMPATIBILITY in identifier syntax etc.
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* Outer syntax: string tokens no longer admit escaped white space,
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which was an accidental (undocumented) feature.  INCOMPATIBILITY, use
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white space without escapes.
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* Outer syntax: string tokens may contain arbitrary character codes
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specified via 3 decimal digits (as in SML).  E.g. "foo\095bar" for
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"foo_bar".
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*** Pure ***
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* Context-dependent token translations.  Default setup reverts locally
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fixed variables, and adds hilite markup for undeclared frees.
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* Unused theorems can be found using the new command 'unused_thms'.
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There are three ways of invoking it:
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(1) unused_thms
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     Only finds unused theorems in the current theory.
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(2) unused_thms thy_1 ... thy_n -
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     Finds unused theorems in the current theory and all of its ancestors,
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     excluding the theories thy_1 ... thy_n and all of their ancestors.
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(3) unused_thms thy_1 ... thy_n - thy'_1 ... thy'_m
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     Finds unused theorems in the theories thy'_1 ... thy'_m and all of
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     their ancestors, excluding the theories thy_1 ... thy_n and all of
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     their ancestors.
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In order to increase the readability of the list produced by
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unused_thms, theorems that have been created by a particular instance
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of a theory command such as 'inductive' or 'function' are considered
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to belong to the same "group", meaning that if at least one theorem in
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this group is used, the other theorems in the same group are no longer
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reported as unused.  Moreover, if all theorems in the group are
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unused, only one theorem in the group is displayed.
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Note that proof objects have to be switched on in order for
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unused_thms to work properly (i.e. !proofs must be >= 1, which is
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usually the case when using Proof General with the default settings).
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* Authentic naming of facts disallows ad-hoc overwriting of previous
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theorems within the same name space.  INCOMPATIBILITY, need to remove
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duplicate fact bindings, or even accidental fact duplications.  Note
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that tools may maintain dynamically scoped facts systematically, using
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PureThy.add_thms_dynamic.
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* Command 'hide' now allows to hide from "fact" name space as well.
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* Eliminated destructive theorem database, simpset, claset, and
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clasimpset.  Potential INCOMPATIBILITY, really need to observe linear
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update of theories within ML code.
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* Eliminated theory ProtoPure and CPure, leaving just one Pure theory.
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INCOMPATIBILITY, object-logics depending on former Pure require
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additional setup PureThy.old_appl_syntax_setup; object-logics
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depending on former CPure need to refer to Pure.
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* Commands 'use' and 'ML' are now purely functional, operating on
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theory/local_theory.  Removed former 'ML_setup' (on theory), use 'ML'
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instead.  Added 'ML_val' as mere diagnostic replacement for 'ML'.
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INCOMPATIBILITY.
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* Command 'setup': discontinued implicit version with ML reference.
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* Instantiation target allows for simultaneous specification of class
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instance operations together with an instantiation proof.
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Type-checking phase allows to refer to class operations uniformly.
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See src/HOL/Complex/Complex.thy for an Isar example and
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src/HOL/Library/Eval.thy for an ML example.
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* Indexing of literal facts: be more serious about including only
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facts from the visible specification/proof context, but not the
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background context (locale etc.).  Affects `prop` notation and method
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"fact".  INCOMPATIBILITY: need to name facts explicitly in rare
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situations.
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* Method "cases", "induct", "coinduct": removed obsolete/undocumented
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"(open)" option, which used to expose internal bound variables to the
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proof text.
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* Isar statements: removed obsolete case "rule_context".
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INCOMPATIBILITY, better use explicit fixes/assumes.
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* Locale proofs: default proof step now includes 'unfold_locales';
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hence 'proof' without argument may be used to unfold locale
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predicates.
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*** Document preparation ***
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* Simplified pdfsetup.sty: color/hyperref is used unconditionally for
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both pdf and dvi (hyperlinks usually work in xdvi as well); removed
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obsolete thumbpdf setup (contemporary PDF viewers do this on the
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spot); renamed link color from "darkblue" to "linkcolor" (default
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value unchanged, can be redefined via \definecolor); no longer sets
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"a4paper" option (unnecessary or even intrusive).
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* Antiquotation @{lemma A method} proves proposition A by the given
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method (either a method name or a method name plus (optional) method
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arguments in parentheses) and prints A just like @{prop A}.
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*** HOL ***
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* New primrec package.  Specification syntax conforms in style to
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definition/function/....  No separate induction rule is provided.  The
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"primrec" command distinguishes old-style and new-style specifications
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by syntax.  The former primrec package is now named OldPrimrecPackage.
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When adjusting theories, beware: constants stemming from new-style
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primrec specifications have authentic syntax.
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* Metis prover is now an order of magnitude faster, and also works
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with multithreading.
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* Metis: the maximum number of clauses that can be produced from a
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theorem is now given by the attribute max_clauses.  Theorems that
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exceed this number are ignored, with a warning printed.
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* Sledgehammer no longer produces structured proofs by default. To
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enable, declare [[sledgehammer_full = true]].  Attributes
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reconstruction_modulus, reconstruction_sorts renamed
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sledgehammer_modulus, sledgehammer_sorts.  INCOMPATIBILITY.
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* Method "induct_scheme" derives user-specified induction rules
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from well-founded induction and completeness of patterns. This factors
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out some operations that are done internally by the function package
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and makes them available separately.  See
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src/HOL/ex/Induction_Scheme.thy for examples.
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* More flexible generation of measure functions for termination
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proofs: Measure functions can be declared by proving a rule of the
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form "is_measure f" and giving it the [measure_function] attribute.
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The "is_measure" predicate is logically meaningless (always true), and
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just guides the heuristic.  To find suitable measure functions, the
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termination prover sets up the goal "is_measure ?f" of the appropriate
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type and generates all solutions by prolog-style backwards proof using
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the declared rules.
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This setup also deals with rules like 
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  "is_measure f ==> is_measure (list_size f)"
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which accommodates nested datatypes that recurse through lists.
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Similar rules are predeclared for products and option types.
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* Turned the type of sets "'a set" into an abbreviation for "'a => bool"
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  INCOMPATIBILITIES:
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  - Definitions of overloaded constants on sets have to be replaced by
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    definitions on => and bool.
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  - Some definitions of overloaded operators on sets can now be proved
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    using the definitions of the operators on => and bool.  Therefore,
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    the following theorems have been renamed:
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      subset_def   -> subset_eq
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      psubset_def  -> psubset_eq
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      set_diff_def -> set_diff_eq
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      Compl_def    -> Compl_eq
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      Sup_set_def  -> Sup_set_eq
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      Inf_set_def  -> Inf_set_eq
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      sup_set_def  -> sup_set_eq
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      inf_set_def  -> inf_set_eq
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  - Due to the incompleteness of the HO unification algorithm, some
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    rules such as subst may require manual instantiation, if some of
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    the unknowns in the rule is a set.
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  - Higher order unification and forward proofs:
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    The proof pattern
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      have "P (S::'a set)" <...>
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      then have "EX S. P S" ..
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    no longer works (due to the incompleteness of the HO unification
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    algorithm) and must be replaced by the pattern
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      have "EX S. P S"
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      proof
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        show "P S" <...>
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      qed
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  - Calculational reasoning with subst (or similar rules):
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    The proof pattern
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      have "P (S::'a set)" <...>
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      also have "S = T" <...>
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      finally have "P T" .
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    no longer works (for similar reasons as the previous example) and
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    must be replaced by something like
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      have "P (S::'a set)" <...>
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      moreover have "S = T" <...>
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      ultimately have "P T" by simp
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  - Tactics or packages written in ML code:
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    Code performing pattern matching on types via
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      Type ("set", [T]) => ...
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    must be rewritten. Moreover, functions like strip_type or
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    binder_types no longer return the right value when applied to a
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    type of the form
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      T1 => ... => Tn => U => bool
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    rather than
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      T1 => ... => Tn => U set
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* Merged theories Wellfounded_Recursion, Accessible_Part and
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Wellfounded_Relations to theory Wellfounded.
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* Explicit class "eq" for executable equality.  INCOMPATIBILITY.
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* Class finite no longer treats UNIV as class parameter.  Use class
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enum from theory Library/Enum instead to achieve a similar effect.
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INCOMPATIBILITY.
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* Theory List: rule list_induct2 now has explicitly named cases "Nil"
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and "Cons".  INCOMPATIBILITY.
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* HOL (and FOL): renamed variables in rules imp_elim and swap.
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Potential INCOMPATIBILITY.
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* Theory Product_Type: duplicated lemmas split_Pair_apply and
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injective_fst_snd removed, use split_eta and prod_eqI instead.
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Renamed upd_fst to apfst and upd_snd to apsnd.  INCOMPATIBILITY.
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* Theory Nat: removed redundant lemmas that merely duplicate lemmas of
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the same name in theory Orderings:
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  less_trans
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  less_linear
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  le_imp_less_or_eq
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  le_less_trans
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  less_le_trans
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  less_not_sym
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  less_asym
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Renamed less_imp_le to less_imp_le_nat, and less_irrefl to
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less_irrefl_nat.  Potential INCOMPATIBILITY due to more general types
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and different variable names.
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* Library/Option_ord.thy: Canonical order on option type.
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* Library/RBT.thy: Red-black trees, an efficient implementation of
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finite maps.
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* Library/Countable.thy: Type class for countable types.
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* Theory Int: The representation of numerals has changed.  The infix
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operator BIT and the bit datatype with constructors B0 and B1 have
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disappeared.  INCOMPATIBILITY, use "Int.Bit0 x" and "Int.Bit1 y" in
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place of "x BIT bit.B0" and "y BIT bit.B1", respectively.  Theorems
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involving BIT, B0, or B1 have been renamed with "Bit0" or "Bit1"
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accordingly.
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* Theory Nat: definition of <= and < on natural numbers no longer
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depend on well-founded relations.  INCOMPATIBILITY.  Definitions
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le_def and less_def have disappeared.  Consider lemmas not_less
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[symmetric, where ?'a = nat] and less_eq [symmetric] instead.
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* Theory Finite_Set: locales ACf, ACe, ACIf, ACIfSL and ACIfSLlin
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(whose purpose mainly is for various fold_set functionals) have been
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abandoned in favor of the existing algebraic classes
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ab_semigroup_mult, comm_monoid_mult, ab_semigroup_idem_mult,
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lower_semilattice (resp. upper_semilattice) and linorder.
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INCOMPATIBILITY.
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* Theory Transitive_Closure: induct and cases rules now declare proper
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case_names ("base" and "step").  INCOMPATIBILITY.
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* Theorem Inductive.lfp_ordinal_induct generalized to complete
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lattices.  The form set-specific version is available as
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Inductive.lfp_ordinal_induct_set.
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* Renamed theorems "power.simps" to "power_int.simps".
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INCOMPATIBILITY.
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wenzelm@26180
   354
* Class semiring_div provides basic abstract properties of semirings
haftmann@25942
   355
with division and modulo operations.  Subsumes former class dvd_mod.
haftmann@25942
   356
wenzelm@26180
   357
* Merged theories IntDef, Numeral and IntArith into unified theory
wenzelm@26180
   358
Int.  INCOMPATIBILITY.
wenzelm@26180
   359
wenzelm@26180
   360
* Theory Library/Code_Index: type "index" now represents natural
wenzelm@26180
   361
numbers rather than integers.  INCOMPATIBILITY.
wenzelm@26180
   362
wenzelm@26180
   363
* New class "uminus" with operation "uminus" (split of from class
wenzelm@26180
   364
"minus" which now only has operation "minus", binary).
haftmann@25919
   365
INCOMPATIBILITY.
haftmann@25919
   366
wenzelm@25522
   367
* Constants "card", "internal_split", "option_map" now with authentic
haftmann@25919
   368
syntax.  INCOMPATIBILITY.
wenzelm@25522
   369
wenzelm@25522
   370
* Definitions subset_def, psubset_def, set_diff_def, Compl_def,
wenzelm@25522
   371
le_bool_def, less_bool_def, le_fun_def, less_fun_def, inf_bool_def,
wenzelm@25522
   372
sup_bool_def, Inf_bool_def, Sup_bool_def, inf_fun_def, sup_fun_def,
wenzelm@25522
   373
Inf_fun_def, Sup_fun_def, inf_set_def, sup_set_def, Inf_set_def,
wenzelm@25522
   374
Sup_set_def, le_def, less_def, option_map_def now with object
haftmann@25919
   375
equality.  INCOMPATIBILITY.
wenzelm@25464
   376
schirmer@25705
   377
* Records. Removed K_record, and replaced it by pure lambda term
wenzelm@25726
   378
%x. c. The simplifier setup is now more robust against eta expansion.
schirmer@25705
   379
INCOMPATIBILITY: in cases explicitly referring to K_record.
wenzelm@25464
   380
wenzelm@27067
   381
* Library/Multiset: {#a, b, c#} abbreviates {#a#} + {#b#} + {#c#}.
wenzelm@27067
   382
wenzelm@27067
   383
* Library/ListVector: new theory of arithmetic vector operations.
wenzelm@27067
   384
wenzelm@27067
   385
* Library/Order_Relation: new theory of various orderings as sets of
wenzelm@27067
   386
pairs.  Defines preorders, partial orders, linear orders and
wenzelm@27067
   387
well-orders on sets and on types.
krauss@26877
   388
wenzelm@25726
   389
krauss@26197
   390
*** ZF ***
krauss@26197
   391
wenzelm@26874
   392
* Renamed some theories to allow to loading both ZF and HOL in the
wenzelm@26874
   393
same session:
wenzelm@26874
   394
wenzelm@26874
   395
  Datatype  -> Datatype_ZF
wenzelm@26874
   396
  Inductive -> Inductive_ZF
wenzelm@26874
   397
  Int       -> Int_ZF
wenzelm@26874
   398
  IntDiv    -> IntDiv_ZF
wenzelm@26874
   399
  Nat       -> Nat_ZF
wenzelm@26874
   400
  List      -> List_ZF
wenzelm@26874
   401
  Main      -> Main_ZF
wenzelm@26874
   402
wenzelm@26874
   403
INCOMPATIBILITY: ZF theories that import individual theories below
wenzelm@26874
   404
Main might need to be adapted.  Regular theory Main is still
wenzelm@26874
   405
available, as trivial extension of Main_ZF.
krauss@26197
   406
krauss@26197
   407
wenzelm@25737
   408
*** ML ***
wenzelm@25737
   409
wenzelm@27067
   410
* ML within Isar: antiquotation @{const name} or @{const
wenzelm@27067
   411
name(typargs)} produces statically-checked Const term.
wenzelm@27067
   412
wenzelm@26401
   413
* Functor NamedThmsFun: data is available to the user as dynamic fact
wenzelm@26724
   414
(of the same name).  Removed obsolete print command.
wenzelm@26401
   415
wenzelm@27067
   416
* Removed obsolete "use_legacy_bindings" function.
wenzelm@26188
   417
wenzelm@25737
   418
* The ``print mode'' is now a thread-local value derived from a global
wenzelm@25737
   419
template (the former print_mode reference), thus access becomes
wenzelm@25737
   420
non-critical.  The global print_mode reference is for session
wenzelm@25737
   421
management only; user-code should use print_mode_value,
wenzelm@25737
   422
print_mode_active, PrintMode.setmp etc.  INCOMPATIBILITY.
wenzelm@25737
   423
wenzelm@26874
   424
* Functions system/system_out provide a robust way to invoke external
wenzelm@27008
   425
shell commands, with propagation of interrupts (requires Poly/ML 5.2).
wenzelm@26874
   426
Do not use OS.Process.system etc. from the basis library!
wenzelm@26222
   427
wenzelm@25737
   428
wenzelm@25626
   429
*** System ***
wenzelm@25626
   430
wenzelm@25971
   431
* Default settings: PROOFGENERAL_OPTIONS no longer impose xemacs ---
wenzelm@25971
   432
in accordance with Proof General 3.7, which prefers GNU emacs.
wenzelm@25970
   433
wenzelm@25626
   434
* isatool tty runs Isabelle process with plain tty interaction;
wenzelm@25626
   435
optional line editor may be specified via ISABELLE_LINE_EDITOR
wenzelm@25626
   436
setting, the default settings attempt to locate "ledit" and "rlwrap".
wenzelm@25626
   437
wenzelm@25651
   438
* isatool browser now works with Cygwin as well, using general
wenzelm@25651
   439
"javapath" function defined in Isabelle process environment.
wenzelm@25651
   440
wenzelm@27067
   441
* YXML notation provides a simple and efficient alternative to
wenzelm@27067
   442
standard XML transfer syntax.  See src/Pure/General/yxml.ML and
wenzelm@27067
   443
isatool yxml as described in the Isabelle system manual.
wenzelm@25651
   444
wenzelm@25652
   445
* JVM class isabelle.IsabelleProcess (located in Isabelle/lib/classes)
wenzelm@25651
   446
provides general wrapper for managing an Isabelle process in a robust
wenzelm@25651
   447
fashion, with ``cooked'' output from stdin/stderr.
wenzelm@25651
   448
wenzelm@25855
   449
* Rudimentary Isabelle plugin for jEdit (see Isabelle/lib/jedit),
wenzelm@25855
   450
based on Isabelle/JVM process wrapper (see Isabelle/lib/classes).
wenzelm@25855
   451
wenzelm@27067
   452
* Removed obsolete THIS_IS_ISABELLE_BUILD feature.  NB: the documented
wenzelm@27067
   453
way of changing the user's settings is via
wenzelm@27067
   454
ISABELLE_HOME_USER/etc/settings, which is a fully featured bash
wenzelm@27067
   455
script.
wenzelm@27067
   456
wenzelm@27067
   457
* Multithreading.max_threads := 0 refers to the number of actual CPU
wenzelm@27067
   458
cores of the underlying machine, which is a good starting point for
wenzelm@27067
   459
optimal performance tuning.  The corresponding usedir option -M allows
wenzelm@27067
   460
"max" as an alias for "0".  WARNING: does not work on certain versions
wenzelm@27067
   461
of Mac OS (with Poly/ML 5.1).
wenzelm@27067
   462
wenzelm@27067
   463
* isabelle-process: non-ML sessions are run with "nice", to reduce the
wenzelm@27067
   464
adverse effect of Isabelle flooding interactive front-ends (notably
wenzelm@27067
   465
ProofGeneral / XEmacs).
wenzelm@27067
   466
wenzelm@25626
   467
wenzelm@25464
   468
wenzelm@25429
   469
New in Isabelle2007 (November 2007)
wenzelm@25429
   470
-----------------------------------
wenzelm@17754
   471
wenzelm@17754
   472
*** General ***
wenzelm@17754
   473
wenzelm@22826
   474
* More uniform information about legacy features, notably a
wenzelm@22826
   475
warning/error of "Legacy feature: ...", depending on the state of the
wenzelm@23367
   476
tolerate_legacy_features flag (default true). FUTURE INCOMPATIBILITY:
wenzelm@23367
   477
legacy features will disappear eventually.
wenzelm@22826
   478
wenzelm@17918
   479
* Theory syntax: the header format ``theory A = B + C:'' has been
wenzelm@17918
   480
discontinued in favour of ``theory A imports B C begin''.  Use isatool
wenzelm@17918
   481
fixheaders to convert existing theory files.  INCOMPATIBILITY.
wenzelm@17918
   482
wenzelm@17918
   483
* Theory syntax: the old non-Isar theory file format has been
wenzelm@17918
   484
discontinued altogether.  Note that ML proof scripts may still be used
wenzelm@17918
   485
with Isar theories; migration is usually quite simple with the ML
wenzelm@17918
   486
function use_legacy_bindings.  INCOMPATIBILITY.
wenzelm@17918
   487
wenzelm@22871
   488
* Theory syntax: some popular names (e.g. 'class', 'declaration',
wenzelm@22871
   489
'fun', 'help', 'if') are now keywords.  INCOMPATIBILITY, use double
wenzelm@22871
   490
quotes.
wenzelm@19814
   491
wenzelm@23888
   492
* Theory loader: be more serious about observing the static theory
wenzelm@23888
   493
header specifications (including optional directories), but not the
wenzelm@24172
   494
accidental file locations of previously successful loads.  The strict
wenzelm@24172
   495
update policy of former update_thy is now already performed by
wenzelm@24172
   496
use_thy, so the former has been removed; use_thys updates several
wenzelm@24172
   497
theories simultaneously, just as 'imports' within a theory header
wenzelm@24172
   498
specification, but without merging the results.  Potential
wenzelm@24172
   499
INCOMPATIBILITY: may need to refine theory headers and commands
wenzelm@24172
   500
ROOT.ML which depend on load order.
wenzelm@23888
   501
wenzelm@23888
   502
* Theory loader: optional support for content-based file
wenzelm@23888
   503
identification, instead of the traditional scheme of full physical
wenzelm@23889
   504
path plus date stamp; configured by the ISABELLE_FILE_IDENT setting
wenzelm@23888
   505
(cf. the system manual).  The new scheme allows to work with
wenzelm@23888
   506
non-finished theories in persistent session images, such that source
wenzelm@23888
   507
files may be moved later on without requiring reloads.
wenzelm@23888
   508
wenzelm@24187
   509
* Theory loader: old-style ML proof scripts being *attached* to a thy
wenzelm@24187
   510
file (with the same base name as the theory) are considered a legacy
wenzelm@24800
   511
feature, which will disappear eventually. Even now, the theory loader
wenzelm@24800
   512
no longer maintains dependencies on such files.
wenzelm@24800
   513
wenzelm@24800
   514
* Syntax: the scope for resolving ambiguities via type-inference is
wenzelm@24800
   515
now limited to individual terms, instead of whole simultaneous
wenzelm@24234
   516
specifications as before. This greatly reduces the complexity of the
wenzelm@24234
   517
syntax module and improves flexibility by separating parsing and
wenzelm@24234
   518
type-checking. INCOMPATIBILITY: additional type-constraints (explicit
wenzelm@24234
   519
'fixes' etc.) are required in rare situations.
wenzelm@24234
   520
wenzelm@25034
   521
* Syntax: constants introduced by new-style packages ('definition',
wenzelm@25034
   522
'abbreviation' etc.) are passed through the syntax module in
wenzelm@25034
   523
``authentic mode''. This means that associated mixfix annotations
wenzelm@25034
   524
really stick to such constants, independently of potential name space
wenzelm@25034
   525
ambiguities introduced later on. INCOMPATIBILITY: constants in parse
wenzelm@25034
   526
trees are represented slightly differently, may need to adapt syntax
wenzelm@25034
   527
translations accordingly. Use CONST marker in 'translations' and
wenzelm@25034
   528
@{const_syntax} antiquotation in 'parse_translation' etc.
wenzelm@25034
   529
wenzelm@17981
   530
* Legacy goal package: reduced interface to the bare minimum required
wenzelm@17981
   531
to keep existing proof scripts running.  Most other user-level
wenzelm@17981
   532
functions are now part of the OldGoals structure, which is *not* open
wenzelm@17981
   533
by default (consider isatool expandshort before open OldGoals).
wenzelm@17981
   534
Removed top_sg, prin, printyp, pprint_term/typ altogether, because
wenzelm@17981
   535
these tend to cause confusion about the actual goal (!) context being
wenzelm@17981
   536
used here, which is not necessarily the same as the_context().
wenzelm@17918
   537
wenzelm@23379
   538
* Command 'find_theorems': supports "*" wild-card in "name:"
wenzelm@23379
   539
criterion; "with_dups" option.  Certain ProofGeneral versions might
wenzelm@23379
   540
support a specific search form (see ProofGeneral/CHANGES).
webertj@22965
   541
wenzelm@20370
   542
* The ``prems limit'' option (cf. ProofContext.prems_limit) is now -1
wenzelm@20370
   543
by default, which means that "prems" (and also "fixed variables") are
wenzelm@20370
   544
suppressed from proof state output.  Note that the ProofGeneral
wenzelm@20370
   545
settings mechanism allows to change and save options persistently, but
wenzelm@20370
   546
older versions of Isabelle will fail to start up if a negative prems
wenzelm@20370
   547
limit is imposed.
wenzelm@20370
   548
wenzelm@21308
   549
* Local theory targets may be specified by non-nested blocks of
wenzelm@21308
   550
``context/locale/class ... begin'' followed by ``end''.  The body may
wenzelm@21308
   551
contain definitions, theorems etc., including any derived mechanism
wenzelm@21308
   552
that has been implemented on top of these primitives.  This concept
wenzelm@21308
   553
generalizes the existing ``theorem (in ...)'' towards more versatility
wenzelm@21308
   554
and scalability.
wenzelm@21308
   555
wenzelm@21960
   556
* Proof General interface: proper undo of final 'end' command;
wenzelm@21960
   557
discontinued Isabelle/classic mode (ML proof scripts).
wenzelm@21960
   558
wenzelm@17754
   559
wenzelm@17865
   560
*** Document preparation ***
wenzelm@17865
   561
wenzelm@21717
   562
* Added antiquotation @{theory name} which prints the given name,
wenzelm@21717
   563
after checking that it refers to a valid ancestor theory in the
wenzelm@21717
   564
current context.
haftmann@21339
   565
wenzelm@17869
   566
* Added antiquotations @{ML_type text} and @{ML_struct text} which
wenzelm@17869
   567
check the given source text as ML type/structure, printing verbatim.
wenzelm@17865
   568
wenzelm@21717
   569
* Added antiquotation @{abbrev "c args"} which prints the abbreviation
wenzelm@21717
   570
"c args == rhs" given in the current context.  (Any number of
wenzelm@21735
   571
arguments may be given on the LHS.)
wenzelm@21717
   572
wenzelm@21717
   573
wenzelm@17779
   574
*** Pure ***
wenzelm@17779
   575
wenzelm@24800
   576
* The 'class' package offers a combination of axclass and locale to
wenzelm@25129
   577
achieve Haskell-like type classes in Isabelle.  Definitions and
wenzelm@25129
   578
theorems within a class context produce both relative results (with
wenzelm@25129
   579
implicit parameters according to the locale context), and polymorphic
wenzelm@25129
   580
constants with qualified polymorphism (according to the class
wenzelm@25129
   581
context).  Within the body context of a 'class' target, a separate
wenzelm@25129
   582
syntax layer ("user space type system") takes care of converting
wenzelm@25129
   583
between global polymorphic consts and internal locale representation.
wenzelm@25177
   584
See src/HOL/ex/Classpackage.thy for examples (as well as main HOL).
haftmann@25184
   585
"isatool doc classes" provides a tutorial.
wenzelm@20807
   586
haftmann@25199
   587
* Generic code generator framework allows to generate executable
wenzelm@24800
   588
code for ML and Haskell (including Isabelle classes).  A short usage
wenzelm@24800
   589
sketch:
haftmann@20188
   590
haftmann@20188
   591
    internal compilation:
haftmann@25199
   592
        export_code <list of constants (term syntax)> in SML
haftmann@20453
   593
    writing SML code to a file:
haftmann@25199
   594
        export_code <list of constants (term syntax)> in SML <filename>
haftmann@22735
   595
    writing OCaml code to a file:
haftmann@25199
   596
        export_code <list of constants (term syntax)> in OCaml <filename>
haftmann@20188
   597
    writing Haskell code to a bunch of files:
haftmann@25199
   598
        export_code <list of constants (term syntax)> in Haskell <filename>
haftmann@25199
   599
haftmann@25199
   600
    evaluating closed propositions to True/False using code generation:
haftmann@25184
   601
        method ``eval''
haftmann@25184
   602
haftmann@25184
   603
Reasonable default setup of framework in HOL.
haftmann@20453
   604
haftmann@20453
   605
Theorem attributs for selecting and transforming function equations theorems:
haftmann@20453
   606
haftmann@22845
   607
    [code fun]:        select a theorem as function equation for a specific constant
haftmann@22845
   608
    [code fun del]:    deselect a theorem as function equation for a specific constant
haftmann@22845
   609
    [code inline]:     select an equation theorem for unfolding (inlining) in place
haftmann@22845
   610
    [code inline del]: deselect an equation theorem for unfolding (inlining) in place
haftmann@20453
   611
haftmann@22735
   612
User-defined serializations (target in {SML, OCaml, Haskell}):
haftmann@20453
   613
haftmann@20453
   614
    code_const <and-list of constants (term syntax)>
haftmann@20453
   615
      {(target) <and-list of const target syntax>}+
haftmann@20453
   616
haftmann@20453
   617
    code_type <and-list of type constructors>
haftmann@20453
   618
      {(target) <and-list of type target syntax>}+
haftmann@20453
   619
haftmann@20453
   620
    code_instance <and-list of instances>
haftmann@20453
   621
      {(target)}+
haftmann@20453
   622
        where instance ::= <type constructor> :: <class>
haftmann@20453
   623
haftmann@20453
   624
    code_class <and_list of classes>
haftmann@20453
   625
      {(target) <and-list of class target syntax>}+
haftmann@20453
   626
        where class target syntax ::= <class name> {where {<classop> == <target syntax>}+}?
haftmann@20453
   627
haftmann@25199
   628
code_instance and code_class only are effective to target Haskell.
haftmann@22735
   629
wenzelm@25177
   630
For example usage see src/HOL/ex/Codegenerator.thy and
wenzelm@25177
   631
src/HOL/ex/Codegenerator_Pretty.thy.  A separate tutorial on code
wenzelm@24800
   632
generation from Isabelle/HOL theories is available via "isatool doc
wenzelm@24800
   633
codegen".
haftmann@20188
   634
wenzelm@25129
   635
* Code generator: consts in 'consts_code' Isar commands are now
wenzelm@25129
   636
referred to by usual term syntax (including optional type
wenzelm@25129
   637
annotations).
wenzelm@25129
   638
wenzelm@19254
   639
* Command 'no_translations' removes translation rules from theory
wenzelm@19254
   640
syntax.
wenzelm@19254
   641
wenzelm@19625
   642
* Overloaded definitions are now actually checked for acyclic
wenzelm@19714
   643
dependencies.  The overloading scheme is slightly more general than
wenzelm@19714
   644
that of Haskell98, although Isabelle does not demand an exact
wenzelm@19714
   645
correspondence to type class and instance declarations.
wenzelm@19714
   646
INCOMPATIBILITY, use ``defs (unchecked overloaded)'' to admit more
wenzelm@19714
   647
exotic versions of overloading -- at the discretion of the user!
wenzelm@19711
   648
wenzelm@19711
   649
Polymorphic constants are represented via type arguments, i.e. the
wenzelm@19711
   650
instantiation that matches an instance against the most general
wenzelm@19711
   651
declaration given in the signature.  For example, with the declaration
wenzelm@19711
   652
c :: 'a => 'a => 'a, an instance c :: nat => nat => nat is represented
wenzelm@19711
   653
as c(nat).  Overloading is essentially simultaneous structural
wenzelm@19711
   654
recursion over such type arguments.  Incomplete specification patterns
wenzelm@19714
   655
impose global constraints on all occurrences, e.g. c('a * 'a) on the
wenzelm@19715
   656
LHS means that more general c('a * 'b) will be disallowed on any RHS.
wenzelm@19714
   657
Command 'print_theory' outputs the normalized system of recursive
wenzelm@19714
   658
equations, see section "definitions".
wenzelm@19625
   659
wenzelm@24086
   660
* Configuration options are maintained within the theory or proof
wenzelm@24086
   661
context (with name and type bool/int/string), providing a very simple
wenzelm@24086
   662
interface to a poor-man's version of general context data.  Tools may
wenzelm@24110
   663
declare options in ML (e.g. using Attrib.config_int) and then refer to
wenzelm@24110
   664
these values using Config.get etc.  Users may change options via an
wenzelm@24110
   665
associated attribute of the same name.  This form of context
wenzelm@24110
   666
declaration works particularly well with commands 'declare' or
wenzelm@24110
   667
'using', for example ``declare [[foo = 42]]''.  Thus it has become
wenzelm@24110
   668
very easy to avoid global references, which would not observe Isar
wenzelm@24110
   669
toplevel undo/redo and fail to work with multithreading.
wenzelm@24086
   670
wenzelm@24172
   671
Various global ML references of Pure and HOL have been turned into
wenzelm@24172
   672
configuration options:
wenzelm@24172
   673
wenzelm@24172
   674
  Unify.search_bound		unify_search_bound
wenzelm@24172
   675
  Unify.trace_bound		unify_trace_bound
wenzelm@24172
   676
  Unify.trace_simp		unify_trace_simp
wenzelm@24172
   677
  Unify.trace_types		unify_trace_types
wenzelm@24172
   678
  Simplifier.simp_depth_limit	simp_depth_limit
wenzelm@24172
   679
  Blast.depth_limit		blast_depth_limit
wenzelm@24172
   680
  DatatypeProp.dtK		datatype_distinctness_limit
wenzelm@24172
   681
  fast_arith_neq_limit  	fast_arith_neq_limit
wenzelm@24172
   682
  fast_arith_split_limit	fast_arith_split_limit
wenzelm@24172
   683
wenzelm@24086
   684
* Named collections of theorems may be easily installed as context
wenzelm@24800
   685
data using the functor NamedThmsFun (see also
wenzelm@24086
   686
src/Pure/Tools/named_thms.ML).  The user may add or delete facts via
wenzelm@24110
   687
attributes; there is also a toplevel print command.  This facility is
wenzelm@24110
   688
just a common case of general context data, which is the preferred way
wenzelm@24110
   689
for anything more complex than just a list of facts in canonical
wenzelm@24110
   690
order.
wenzelm@24086
   691
wenzelm@24032
   692
* Isar: command 'declaration' augments a local theory by generic
wenzelm@24032
   693
declaration functions written in ML.  This enables arbitrary content
wenzelm@24032
   694
being added to the context, depending on a morphism that tells the
wenzelm@24032
   695
difference of the original declaration context wrt. the application
wenzelm@24032
   696
context encountered later on.
wenzelm@24032
   697
wenzelm@24032
   698
* Isar: proper interfaces for simplification procedures.  Command
wenzelm@24032
   699
'simproc_setup' declares named simprocs (with match patterns, and body
wenzelm@24032
   700
text in ML).  Attribute "simproc" adds/deletes simprocs in the current
wenzelm@24032
   701
context.  ML antiquotation @{simproc name} retrieves named simprocs.
wenzelm@24032
   702
wenzelm@24032
   703
* Isar: an extra pair of brackets around attribute declarations
wenzelm@24032
   704
abbreviates a theorem reference involving an internal dummy fact,
wenzelm@24032
   705
which will be ignored later --- only the effect of the attribute on
wenzelm@24032
   706
the background context will persist.  This form of in-place
wenzelm@24032
   707
declarations is particularly useful with commands like 'declare' and
wenzelm@24032
   708
'using', for example ``have A using [[simproc a]] by simp''.
wenzelm@24032
   709
wenzelm@23369
   710
* Isar: method "assumption" (and implicit closing of subproofs) now
wenzelm@23369
   711
takes simple non-atomic goal assumptions into account: after applying
wenzelm@23369
   712
an assumption as a rule the resulting subgoals are solved by atomic
wenzelm@23369
   713
assumption steps.  This is particularly useful to finish 'obtain'
wenzelm@23369
   714
goals, such as "!!x. (!!x. P x ==> thesis) ==> P x ==> thesis",
wenzelm@23369
   715
without referring to the original premise "!!x. P x ==> thesis" in the
wenzelm@23369
   716
Isar proof context.  POTENTIAL INCOMPATIBILITY: method "assumption" is
wenzelm@23369
   717
more permissive.
wenzelm@23369
   718
wenzelm@23369
   719
* Isar: implicit use of prems from the Isar proof context is
wenzelm@23369
   720
considered a legacy feature.  Common applications like ``have A .''
wenzelm@23369
   721
may be replaced by ``have A by fact'' or ``note `A`''.  In general,
wenzelm@23369
   722
referencing facts explicitly here improves readability and
wenzelm@23369
   723
maintainability of proof texts.
wenzelm@23369
   724
wenzelm@17865
   725
* Isar: improper proof element 'guess' is like 'obtain', but derives
wenzelm@17865
   726
the obtained context from the course of reasoning!  For example:
wenzelm@17865
   727
wenzelm@17865
   728
  assume "EX x y. A x & B y"   -- "any previous fact"
wenzelm@17865
   729
  then guess x and y by clarify
wenzelm@17865
   730
wenzelm@17865
   731
This technique is potentially adventurous, depending on the facts and
wenzelm@17865
   732
proof tools being involved here.
wenzelm@17865
   733
wenzelm@18020
   734
* Isar: known facts from the proof context may be specified as literal
wenzelm@18020
   735
propositions, using ASCII back-quote syntax.  This works wherever
wenzelm@18020
   736
named facts used to be allowed so far, in proof commands, proof
wenzelm@18020
   737
methods, attributes etc.  Literal facts are retrieved from the context
wenzelm@18020
   738
according to unification of type and term parameters.  For example,
wenzelm@18020
   739
provided that "A" and "A ==> B" and "!!x. P x ==> Q x" are known
wenzelm@18020
   740
theorems in the current context, then these are valid literal facts:
wenzelm@18020
   741
`A` and `A ==> B` and `!!x. P x ==> Q x" as well as `P a ==> Q a` etc.
wenzelm@18020
   742
wenzelm@18020
   743
There is also a proof method "fact" which does the same composition
wenzelm@18044
   744
for explicit goal states, e.g. the following proof texts coincide with
wenzelm@18044
   745
certain special cases of literal facts:
wenzelm@18020
   746
wenzelm@18020
   747
  have "A" by fact                 ==  note `A`
wenzelm@18020
   748
  have "A ==> B" by fact           ==  note `A ==> B`
wenzelm@18020
   749
  have "!!x. P x ==> Q x" by fact  ==  note `!!x. P x ==> Q x`
wenzelm@18020
   750
  have "P a ==> Q a" by fact       ==  note `P a ==> Q a`
wenzelm@18020
   751
wenzelm@20118
   752
* Isar: ":" (colon) is no longer a symbolic identifier character in
wenzelm@20118
   753
outer syntax.  Thus symbolic identifiers may be used without
wenzelm@20118
   754
additional white space in declarations like this: ``assume *: A''.
wenzelm@20118
   755
wenzelm@20013
   756
* Isar: 'print_facts' prints all local facts of the current context,
wenzelm@20013
   757
both named and unnamed ones.
wenzelm@20013
   758
wenzelm@18308
   759
* Isar: 'def' now admits simultaneous definitions, e.g.:
wenzelm@18308
   760
wenzelm@18308
   761
  def x == "t" and y == "u"
wenzelm@18308
   762
wenzelm@18540
   763
* Isar: added command 'unfolding', which is structurally similar to
wenzelm@18540
   764
'using', but affects both the goal state and facts by unfolding given
wenzelm@18815
   765
rewrite rules.  Thus many occurrences of the 'unfold' method or
wenzelm@18540
   766
'unfolded' attribute may be replaced by first-class proof text.
wenzelm@18540
   767
wenzelm@18815
   768
* Isar: methods 'unfold' / 'fold', attributes 'unfolded' / 'folded',
wenzelm@18815
   769
and command 'unfolding' now all support object-level equalities
wenzelm@18815
   770
(potentially conditional).  The underlying notion of rewrite rule is
wenzelm@18815
   771
analogous to the 'rule_format' attribute, but *not* that of the
wenzelm@18815
   772
Simplifier (which is usually more generous).
wenzelm@18815
   773
kleing@24238
   774
* Isar: the new attribute [rotated n] (default n = 1) rotates the
kleing@24238
   775
premises of a theorem by n. Useful in conjunction with drule.
kleing@24238
   776
wenzelm@19220
   777
* Isar: the goal restriction operator [N] (default N = 1) evaluates a
wenzelm@19220
   778
method expression within a sandbox consisting of the first N
wenzelm@19240
   779
sub-goals, which need to exist.  For example, ``simp_all [3]''
wenzelm@19240
   780
simplifies the first three sub-goals, while (rule foo, simp_all)[]
wenzelm@19240
   781
simplifies all new goals that emerge from applying rule foo to the
wenzelm@19240
   782
originally first one.
wenzelm@19220
   783
wenzelm@19814
   784
* Isar: schematic goals are no longer restricted to higher-order
wenzelm@19814
   785
patterns; e.g. ``lemma "?P(?x)" by (rule TrueI)'' now works as
wenzelm@19814
   786
expected.
wenzelm@19814
   787
wenzelm@18901
   788
* Isar: the conclusion of a long theorem statement is now either
wenzelm@18901
   789
'shows' (a simultaneous conjunction, as before), or 'obtains'
wenzelm@18901
   790
(essentially a disjunction of cases with local parameters and
wenzelm@18901
   791
assumptions).  The latter allows to express general elimination rules
wenzelm@18910
   792
adequately; in this notation common elimination rules look like this:
wenzelm@18901
   793
wenzelm@18901
   794
  lemma exE:    -- "EX x. P x ==> (!!x. P x ==> thesis) ==> thesis"
wenzelm@18901
   795
    assumes "EX x. P x"
wenzelm@18901
   796
    obtains x where "P x"
wenzelm@18901
   797
wenzelm@18901
   798
  lemma conjE:  -- "A & B ==> (A ==> B ==> thesis) ==> thesis"
wenzelm@18901
   799
    assumes "A & B"
wenzelm@18901
   800
    obtains A and B
wenzelm@18901
   801
wenzelm@18901
   802
  lemma disjE:  -- "A | B ==> (A ==> thesis) ==> (B ==> thesis) ==> thesis"
wenzelm@18901
   803
    assumes "A | B"
wenzelm@18901
   804
    obtains
wenzelm@18901
   805
      A
wenzelm@18901
   806
    | B
wenzelm@18901
   807
wenzelm@18910
   808
The subsequent classical rules even refer to the formal "thesis"
wenzelm@18901
   809
explicitly:
wenzelm@18901
   810
wenzelm@18901
   811
  lemma classical:     -- "(~ thesis ==> thesis) ==> thesis"
wenzelm@18901
   812
    obtains "~ thesis"
wenzelm@18901
   813
wenzelm@18910
   814
  lemma Peirce's_Law:  -- "((thesis ==> something) ==> thesis) ==> thesis"
wenzelm@18910
   815
    obtains "thesis ==> something"
wenzelm@18901
   816
wenzelm@18901
   817
The actual proof of an 'obtains' statement is analogous to that of the
wenzelm@18910
   818
Isar proof element 'obtain', only that there may be several cases.
wenzelm@18910
   819
Optional case names may be specified in parentheses; these will be
wenzelm@18910
   820
available both in the present proof and as annotations in the
wenzelm@18910
   821
resulting rule, for later use with the 'cases' method (cf. attribute
wenzelm@18910
   822
case_names).
wenzelm@18901
   823
wenzelm@21447
   824
* Isar: the assumptions of a long theorem statement are available as
wenzelm@21447
   825
"assms" fact in the proof context.  This is more appropriate than the
wenzelm@21447
   826
(historical) "prems", which refers to all assumptions of the current
wenzelm@21447
   827
context, including those from the target locale, proof body etc.
wenzelm@21447
   828
wenzelm@19263
   829
* Isar: 'print_statement' prints theorems from the current theory or
wenzelm@19263
   830
proof context in long statement form, according to the syntax of a
wenzelm@19263
   831
top-level lemma.
wenzelm@19263
   832
wenzelm@18901
   833
* Isar: 'obtain' takes an optional case name for the local context
wenzelm@18901
   834
introduction rule (default "that").
wenzelm@18901
   835
wenzelm@19587
   836
* Isar: removed obsolete 'concl is' patterns.  INCOMPATIBILITY, use
wenzelm@19587
   837
explicit (is "_ ==> ?foo") in the rare cases where this still happens
wenzelm@19587
   838
to occur.
wenzelm@19587
   839
wenzelm@19682
   840
* Pure: syntax "CONST name" produces a fully internalized constant
wenzelm@19682
   841
according to the current context.  This is particularly useful for
wenzelm@19682
   842
syntax translations that should refer to internal constant
wenzelm@19682
   843
representations independently of name spaces.
wenzelm@19682
   844
wenzelm@21537
   845
* Pure: syntax constant for foo (binder "FOO ") is called "foo_binder"
wenzelm@21537
   846
instead of "FOO ". This allows multiple binder declarations to coexist
wenzelm@21537
   847
in the same context.  INCOMPATIBILITY.
wenzelm@21537
   848
wenzelm@21209
   849
* Isar/locales: 'notation' provides a robust interface to the 'syntax'
wenzelm@21209
   850
primitive that also works in a locale context (both for constants and
wenzelm@24950
   851
fixed variables). Type declaration and internal syntactic representation
wenzelm@24950
   852
of given constants retrieved from the context. Likewise, the
wenzelm@24950
   853
'no_notation' command allows to remove given syntax annotations from the
wenzelm@24950
   854
current context.
wenzelm@19682
   855
wenzelm@19665
   856
* Isar/locales: new derived specification elements 'axiomatization',
wenzelm@19665
   857
'definition', 'abbreviation', which support type-inference, admit
wenzelm@19083
   858
object-level specifications (equality, equivalence).  See also the
wenzelm@19083
   859
isar-ref manual.  Examples:
wenzelm@19081
   860
wenzelm@19665
   861
  axiomatization
wenzelm@21595
   862
    eq  (infix "===" 50) where
wenzelm@21595
   863
    eq_refl: "x === x" and eq_subst: "x === y ==> P x ==> P y"
wenzelm@21595
   864
wenzelm@21595
   865
  definition "f x y = x + y + 1"
wenzelm@21595
   866
  definition g where "g x = f x x"
wenzelm@19081
   867
wenzelm@19363
   868
  abbreviation
wenzelm@21595
   869
    neq  (infix "=!=" 50) where
wenzelm@19363
   870
    "x =!= y == ~ (x === y)"
wenzelm@19081
   871
wenzelm@19083
   872
These specifications may be also used in a locale context.  Then the
wenzelm@19083
   873
constants being introduced depend on certain fixed parameters, and the
wenzelm@19083
   874
constant name is qualified by the locale base name.  An internal
wenzelm@19083
   875
abbreviation takes care for convenient input and output, making the
wenzelm@19088
   876
parameters implicit and using the original short name.  See also
wenzelm@25177
   877
src/HOL/ex/Abstract_NAT.thy for an example of deriving polymorphic
wenzelm@19083
   878
entities from a monomorphic theory.
wenzelm@19083
   879
wenzelm@19083
   880
Presently, abbreviations are only available 'in' a target locale, but
wenzelm@19363
   881
not inherited by general import expressions.  Also note that
wenzelm@19363
   882
'abbreviation' may be used as a type-safe replacement for 'syntax' +
wenzelm@24735
   883
'translations' in common applications.  The "no_abbrevs" print mode
wenzelm@24735
   884
prevents folding of abbreviations in term output.
wenzelm@19084
   885
wenzelm@19682
   886
Concrete syntax is attached to specified constants in internal form,
wenzelm@19682
   887
independently of name spaces.  The parse tree representation is
wenzelm@21209
   888
slightly different -- use 'notation' instead of raw 'syntax', and
wenzelm@19682
   889
'translations' with explicit "CONST" markup to accommodate this.
wenzelm@19665
   890
wenzelm@24800
   891
* Pure/Isar: unified syntax for new-style specification mechanisms
wenzelm@24800
   892
(e.g.  'definition', 'abbreviation', or 'inductive' in HOL) admits
wenzelm@24800
   893
full type inference and dummy patterns ("_").  For example:
wenzelm@24735
   894
wenzelm@24735
   895
  definition "K x _ = x"
wenzelm@24735
   896
wenzelm@24738
   897
  inductive conj for A B
wenzelm@24738
   898
  where "A ==> B ==> conj A B"
wenzelm@24738
   899
wenzelm@21735
   900
* Pure: command 'print_abbrevs' prints all constant abbreviations of
wenzelm@21735
   901
the current context.  Print mode "no_abbrevs" prevents inversion of
wenzelm@21735
   902
abbreviations on output.
wenzelm@21735
   903
wenzelm@24800
   904
* Isar/locales: improved parameter handling: use of locales "var" and
wenzelm@24800
   905
"struct" no longer necessary; - parameter renamings are no longer
wenzelm@24800
   906
required to be injective.  For example, this allows to define
wenzelm@24800
   907
endomorphisms as locale endom = homom mult mult h.
ballarin@19783
   908
ballarin@19931
   909
* Isar/locales: changed the way locales with predicates are defined.
ballarin@19931
   910
Instead of accumulating the specification, the imported expression is
wenzelm@22126
   911
now an interpretation.  INCOMPATIBILITY: different normal form of
wenzelm@22126
   912
locale expressions.  In particular, in interpretations of locales with
wenzelm@22126
   913
predicates, goals repesenting already interpreted fragments are not
wenzelm@22126
   914
removed automatically.  Use methods `intro_locales' and
wenzelm@22126
   915
`unfold_locales'; see below.
wenzelm@22126
   916
wenzelm@22126
   917
* Isar/locales: new methods `intro_locales' and `unfold_locales'
wenzelm@22126
   918
provide backward reasoning on locales predicates.  The methods are
wenzelm@22126
   919
aware of interpretations and discharge corresponding goals.
wenzelm@22126
   920
`intro_locales' is less aggressive then `unfold_locales' and does not
wenzelm@22126
   921
unfold predicates to assumptions.
ballarin@19931
   922
ballarin@19931
   923
* Isar/locales: the order in which locale fragments are accumulated
wenzelm@22126
   924
has changed.  This enables to override declarations from fragments due
wenzelm@22126
   925
to interpretations -- for example, unwanted simp rules.
ballarin@19931
   926
ballarin@23920
   927
* Isar/locales: interpretation in theories and proof contexts has been
ballarin@23920
   928
extended.  One may now specify (and prove) equations, which are
ballarin@23920
   929
unfolded in interpreted theorems.  This is useful for replacing
ballarin@23920
   930
defined concepts (constants depending on locale parameters) by
ballarin@23920
   931
concepts already existing in the target context.  Example:
ballarin@23920
   932
ballarin@23920
   933
  interpretation partial_order ["op <= :: [int, int] => bool"]
ballarin@23920
   934
    where "partial_order.less (op <=) (x::int) y = (x < y)"
ballarin@23920
   935
wenzelm@24800
   936
Typically, the constant `partial_order.less' is created by a
wenzelm@24800
   937
definition specification element in the context of locale
wenzelm@24800
   938
partial_order.
wenzelm@24800
   939
wenzelm@24859
   940
* Method "induct": improved internal context management to support
wenzelm@24800
   941
local fixes and defines on-the-fly. Thus explicit meta-level
wenzelm@24800
   942
connectives !!  and ==> are rarely required anymore in inductive goals
wenzelm@24800
   943
(using object-logic connectives for this purpose has been long
wenzelm@24800
   944
obsolete anyway). Common proof patterns are explained in
wenzelm@25177
   945
src/HOL/Induct/Common_Patterns.thy, see also
wenzelm@25177
   946
src/HOL/Isar_examples/Puzzle.thy and src/HOL/Lambda for realistic
wenzelm@25177
   947
examples.
wenzelm@24606
   948
wenzelm@24859
   949
* Method "induct": improved handling of simultaneous goals. Instead of
wenzelm@24606
   950
introducing object-level conjunction, the statement is now split into
wenzelm@24606
   951
several conclusions, while the corresponding symbolic cases are nested
wenzelm@24606
   952
accordingly. INCOMPATIBILITY, proofs need to be structured explicitly,
wenzelm@25177
   953
see src/HOL/Induct/Common_Patterns.thy, for example.
wenzelm@24606
   954
wenzelm@24859
   955
* Method "induct": mutual induction rules are now specified as a list
wenzelm@24800
   956
of rule sharing the same induction cases. HOL packages usually provide
wenzelm@24606
   957
foo_bar.inducts for mutually defined items foo and bar (e.g. inductive
wenzelm@24859
   958
predicates/sets or datatypes). INCOMPATIBILITY, users need to specify
wenzelm@24859
   959
mutual induction rules differently, i.e. like this:
wenzelm@18506
   960
wenzelm@18506
   961
  (induct rule: foo_bar.inducts)
wenzelm@18506
   962
  (induct set: foo bar)
wenzelm@24859
   963
  (induct pred: foo bar)
wenzelm@18506
   964
  (induct type: foo bar)
wenzelm@18506
   965
wenzelm@18506
   966
The ML function ProjectRule.projections turns old-style rules into the
wenzelm@18506
   967
new format.
wenzelm@18506
   968
wenzelm@24859
   969
* Method "coinduct": dual of induction, see
wenzelm@18399
   970
src/HOL/Library/Coinductive_List.thy for various examples.
wenzelm@18399
   971
wenzelm@24859
   972
* Method "cases", "induct", "coinduct": the ``(open)'' option is
wenzelm@24859
   973
considered a legacy feature.
wenzelm@24859
   974
wenzelm@20919
   975
* Attribute "symmetric" produces result with standardized schematic
wenzelm@20919
   976
variables (index 0).  Potential INCOMPATIBILITY.
wenzelm@20919
   977
wenzelm@22126
   978
* Simplifier: by default the simplifier trace only shows top level
wenzelm@22126
   979
rewrites now. That is, trace_simp_depth_limit is set to 1 by
wenzelm@22126
   980
default. Thus there is less danger of being flooded by the trace. The
wenzelm@22126
   981
trace indicates where parts have been suppressed.
nipkow@18674
   982
  
wenzelm@18536
   983
* Provers/classical: removed obsolete classical version of elim_format
wenzelm@18536
   984
attribute; classical elim/dest rules are now treated uniformly when
wenzelm@18536
   985
manipulating the claset.
wenzelm@18536
   986
wenzelm@18694
   987
* Provers/classical: stricter checks to ensure that supplied intro,
wenzelm@18694
   988
dest and elim rules are well-formed; dest and elim rules must have at
wenzelm@18694
   989
least one premise.
wenzelm@18694
   990
wenzelm@18694
   991
* Provers/classical: attributes dest/elim/intro take an optional
wenzelm@18695
   992
weight argument for the rule (just as the Pure versions).  Weights are
wenzelm@18696
   993
ignored by automated tools, but determine the search order of single
wenzelm@18694
   994
rule steps.
paulson@18557
   995
wenzelm@18536
   996
* Syntax: input syntax now supports dummy variable binding "%_. b",
wenzelm@18536
   997
where the body does not mention the bound variable.  Note that dummy
wenzelm@18536
   998
patterns implicitly depend on their context of bounds, which makes
wenzelm@18536
   999
"{_. _}" match any set comprehension as expected.  Potential
wenzelm@18536
  1000
INCOMPATIBILITY -- parse translations need to cope with syntactic
wenzelm@18536
  1001
constant "_idtdummy" in the binding position.
wenzelm@18536
  1002
wenzelm@18536
  1003
* Syntax: removed obsolete syntactic constant "_K" and its associated
wenzelm@18536
  1004
parse translation.  INCOMPATIBILITY -- use dummy abstraction instead,
wenzelm@18536
  1005
for example "A -> B" => "Pi A (%_. B)".
wenzelm@17779
  1006
wenzelm@20582
  1007
* Pure: 'class_deps' command visualizes the subclass relation, using
wenzelm@20582
  1008
the graph browser tool.
wenzelm@20582
  1009
wenzelm@24800
  1010
* Pure: 'print_theory' now suppresses certain internal declarations by
wenzelm@24800
  1011
default; use '!' option for full details.
wenzelm@20620
  1012
wenzelm@17865
  1013
nipkow@17806
  1014
*** HOL ***
nipkow@17806
  1015
wenzelm@25129
  1016
* Method "metis" proves goals by applying the Metis general-purpose
wenzelm@25129
  1017
resolution prover (see also http://gilith.com/software/metis/).
wenzelm@25129
  1018
Examples are in the directory MetisExamples.  WARNING: the
wenzelm@25129
  1019
Isabelle/HOL-Metis integration does not yet work properly with
wenzelm@25129
  1020
multi-threading.
wenzelm@25129
  1021
  
wenzelm@25129
  1022
* Command 'sledgehammer' invokes external automatic theorem provers as
wenzelm@25129
  1023
background processes.  It generates calls to the "metis" method if
wenzelm@25129
  1024
successful. These can be pasted into the proof.  Users do not have to
wenzelm@25129
  1025
wait for the automatic provers to return.  WARNING: does not really
wenzelm@25129
  1026
work with multi-threading.
wenzelm@25129
  1027
wenzelm@24804
  1028
* New "auto_quickcheck" feature tests outermost goal statements for
wenzelm@24804
  1029
potential counter-examples.  Controlled by ML references
wenzelm@24804
  1030
auto_quickcheck (default true) and auto_quickcheck_time_limit (default
wenzelm@25129
  1031
5000 milliseconds).  Fails silently if statements is outside of
wenzelm@25129
  1032
executable fragment, or any other codgenerator problem occurs.
wenzelm@24804
  1033
haftmann@25184
  1034
* New constant "undefined" with axiom "undefined x = undefined".
haftmann@25184
  1035
haftmann@25184
  1036
* Added class "HOL.eq", allowing for code generation with polymorphic
haftmann@25184
  1037
equality.
haftmann@25184
  1038
haftmann@25184
  1039
* Some renaming of class constants due to canonical name prefixing in
haftmann@25184
  1040
the new 'class' package:
haftmann@25184
  1041
haftmann@25184
  1042
    HOL.abs ~> HOL.abs_class.abs
haftmann@25184
  1043
    HOL.divide ~> HOL.divide_class.divide
haftmann@25184
  1044
    0 ~> HOL.zero_class.zero
haftmann@25184
  1045
    1 ~> HOL.one_class.one
haftmann@25184
  1046
    op + ~> HOL.plus_class.plus
haftmann@25184
  1047
    op - ~> HOL.minus_class.minus
haftmann@25184
  1048
    uminus ~> HOL.minus_class.uminus
haftmann@25184
  1049
    op * ~> HOL.times_class.times
haftmann@25184
  1050
    op < ~> HOL.ord_class.less
haftmann@25184
  1051
    op <= > HOL.ord_class.less_eq
haftmann@25184
  1052
    Nat.power ~> Power.power_class.power
haftmann@25184
  1053
    Nat.size ~> Nat.size_class.size
haftmann@25184
  1054
    Numeral.number_of ~> Numeral.number_class.number_of
haftmann@25184
  1055
    FixedPoint.Inf ~> Lattices.complete_lattice_class.Inf
haftmann@25184
  1056
    FixedPoint.Sup ~> Lattices.complete_lattice_class.Sup
haftmann@25184
  1057
    Orderings.min ~> Orderings.ord_class.min
haftmann@25184
  1058
    Orderings.max ~> Orderings.ord_class.max
haftmann@25184
  1059
    Divides.op div ~> Divides.div_class.div
haftmann@25184
  1060
    Divides.op mod ~> Divides.div_class.mod
haftmann@25184
  1061
    Divides.op dvd ~> Divides.div_class.dvd
haftmann@25184
  1062
haftmann@25184
  1063
INCOMPATIBILITY.  Adaptions may be required in the following cases:
haftmann@25184
  1064
haftmann@25184
  1065
a) User-defined constants using any of the names "plus", "minus",
haftmann@25184
  1066
"times", "less" or "less_eq". The standard syntax translations for
haftmann@25184
  1067
"+", "-" and "*" may go wrong.  INCOMPATIBILITY: use more specific
haftmann@25184
  1068
names.
haftmann@25184
  1069
haftmann@25184
  1070
b) Variables named "plus", "minus", "times", "less", "less_eq"
haftmann@25184
  1071
INCOMPATIBILITY: use more specific names.
haftmann@25184
  1072
haftmann@25184
  1073
c) Permutative equations (e.g. "a + b = b + a")
haftmann@25184
  1074
Since the change of names also changes the order of terms, permutative
haftmann@25184
  1075
rewrite rules may get applied in a different order. Experience shows
haftmann@25184
  1076
that this is rarely the case (only two adaptions in the whole Isabelle
haftmann@25184
  1077
distribution).  INCOMPATIBILITY: rewrite proofs
haftmann@25184
  1078
haftmann@25184
  1079
d) ML code directly refering to constant names
haftmann@25184
  1080
This in general only affects hand-written proof tactics, simprocs and
haftmann@25184
  1081
so on.  INCOMPATIBILITY: grep your sourcecode and replace names.
haftmann@25184
  1082
Consider using @{const_name} antiquotation.
haftmann@25184
  1083
haftmann@25184
  1084
* New class "default" with associated constant "default".
haftmann@25184
  1085
haftmann@25184
  1086
* Function "sgn" is now overloaded and available on int, real, complex
haftmann@25184
  1087
(and other numeric types), using class "sgn".  Two possible defs of
haftmann@25184
  1088
sgn are given as equational assumptions in the classes sgn_if and
haftmann@25184
  1089
sgn_div_norm; ordered_idom now also inherits from sgn_if.
haftmann@25184
  1090
INCOMPATIBILITY.
haftmann@25184
  1091
haftmann@25184
  1092
* Locale "partial_order" now unified with class "order" (cf. theory
haftmann@25184
  1093
Orderings), added parameter "less".  INCOMPATIBILITY.
haftmann@25184
  1094
haftmann@25184
  1095
* Renamings in classes "order" and "linorder": facts "refl", "trans" and
haftmann@25184
  1096
"cases" to "order_refl", "order_trans" and "linorder_cases", to avoid
haftmann@25184
  1097
clashes with HOL "refl" and "trans".  INCOMPATIBILITY.
haftmann@25184
  1098
haftmann@25184
  1099
* Classes "order" and "linorder": potential INCOMPATIBILITY due to
haftmann@25184
  1100
changed order of proof goals in instance proofs.
haftmann@25184
  1101
haftmann@25184
  1102
* The transitivity reasoner for partial and linear orders is set up
haftmann@25184
  1103
for classes "order" and "linorder".  Instances of the reasoner are available
haftmann@25184
  1104
in all contexts importing or interpreting the corresponding locales.
haftmann@25184
  1105
Method "order" invokes the reasoner separately; the reasoner
haftmann@25184
  1106
is also integrated with the Simplifier as a solver.  Diagnostic
haftmann@25184
  1107
command 'print_orders' shows the available instances of the reasoner
haftmann@25184
  1108
in the current context.
haftmann@25184
  1109
haftmann@25184
  1110
* Localized monotonicity predicate in theory "Orderings"; integrated
haftmann@25184
  1111
lemmas max_of_mono and min_of_mono with this predicate.
haftmann@25184
  1112
INCOMPATIBILITY.
haftmann@25184
  1113
haftmann@25184
  1114
* Formulation of theorem "dense" changed slightly due to integration
haftmann@25184
  1115
with new class dense_linear_order.
haftmann@25184
  1116
haftmann@25184
  1117
* Uniform lattice theory development in HOL.
haftmann@25184
  1118
haftmann@25184
  1119
    constants "meet" and "join" now named "inf" and "sup"
haftmann@25184
  1120
    constant "Meet" now named "Inf"
haftmann@25184
  1121
haftmann@25184
  1122
    classes "meet_semilorder" and "join_semilorder" now named
haftmann@25184
  1123
      "lower_semilattice" and "upper_semilattice"
haftmann@25184
  1124
    class "lorder" now named "lattice"
haftmann@25184
  1125
    class "comp_lat" now named "complete_lattice"
haftmann@25184
  1126
haftmann@25184
  1127
    Instantiation of lattice classes allows explicit definitions
haftmann@25184
  1128
    for "inf" and "sup" operations (or "Inf" and "Sup" for complete lattices).
haftmann@25184
  1129
haftmann@25184
  1130
  INCOMPATIBILITY.  Theorem renames:
haftmann@25184
  1131
haftmann@25184
  1132
    meet_left_le            ~> inf_le1
haftmann@25184
  1133
    meet_right_le           ~> inf_le2
haftmann@25184
  1134
    join_left_le            ~> sup_ge1
haftmann@25184
  1135
    join_right_le           ~> sup_ge2
haftmann@25184
  1136
    meet_join_le            ~> inf_sup_ord
haftmann@25184
  1137
    le_meetI                ~> le_infI
haftmann@25184
  1138
    join_leI                ~> le_supI
haftmann@25184
  1139
    le_meet                 ~> le_inf_iff
haftmann@25184
  1140
    le_join                 ~> ge_sup_conv
haftmann@25184
  1141
    meet_idempotent         ~> inf_idem
haftmann@25184
  1142
    join_idempotent         ~> sup_idem
haftmann@25184
  1143
    meet_comm               ~> inf_commute
haftmann@25184
  1144
    join_comm               ~> sup_commute
haftmann@25184
  1145
    meet_leI1               ~> le_infI1
haftmann@25184
  1146
    meet_leI2               ~> le_infI2
haftmann@25184
  1147
    le_joinI1               ~> le_supI1
haftmann@25184
  1148
    le_joinI2               ~> le_supI2
haftmann@25184
  1149
    meet_assoc              ~> inf_assoc
haftmann@25184
  1150
    join_assoc              ~> sup_assoc
haftmann@25184
  1151
    meet_left_comm          ~> inf_left_commute
haftmann@25184
  1152
    meet_left_idempotent    ~> inf_left_idem
haftmann@25184
  1153
    join_left_comm          ~> sup_left_commute
haftmann@25184
  1154
    join_left_idempotent    ~> sup_left_idem
haftmann@25184
  1155
    meet_aci                ~> inf_aci
haftmann@25184
  1156
    join_aci                ~> sup_aci
haftmann@25184
  1157
    le_def_meet             ~> le_iff_inf
haftmann@25184
  1158
    le_def_join             ~> le_iff_sup
haftmann@25184
  1159
    join_absorp2            ~> sup_absorb2
haftmann@25184
  1160
    join_absorp1            ~> sup_absorb1
haftmann@25184
  1161
    meet_absorp1            ~> inf_absorb1
haftmann@25184
  1162
    meet_absorp2            ~> inf_absorb2
haftmann@25184
  1163
    meet_join_absorp        ~> inf_sup_absorb
haftmann@25184
  1164
    join_meet_absorp        ~> sup_inf_absorb
haftmann@25184
  1165
    distrib_join_le         ~> distrib_sup_le
haftmann@25184
  1166
    distrib_meet_le         ~> distrib_inf_le
haftmann@25184
  1167
haftmann@25184
  1168
    add_meet_distrib_left   ~> add_inf_distrib_left
haftmann@25184
  1169
    add_join_distrib_left   ~> add_sup_distrib_left
haftmann@25184
  1170
    is_join_neg_meet        ~> is_join_neg_inf
haftmann@25184
  1171
    is_meet_neg_join        ~> is_meet_neg_sup
haftmann@25184
  1172
    add_meet_distrib_right  ~> add_inf_distrib_right
haftmann@25184
  1173
    add_join_distrib_right  ~> add_sup_distrib_right
haftmann@25184
  1174
    add_meet_join_distribs  ~> add_sup_inf_distribs
haftmann@25184
  1175
    join_eq_neg_meet        ~> sup_eq_neg_inf
haftmann@25184
  1176
    meet_eq_neg_join        ~> inf_eq_neg_sup
haftmann@25184
  1177
    add_eq_meet_join        ~> add_eq_inf_sup
haftmann@25184
  1178
    meet_0_imp_0            ~> inf_0_imp_0
haftmann@25184
  1179
    join_0_imp_0            ~> sup_0_imp_0
haftmann@25184
  1180
    meet_0_eq_0             ~> inf_0_eq_0
haftmann@25184
  1181
    join_0_eq_0             ~> sup_0_eq_0
haftmann@25184
  1182
    neg_meet_eq_join        ~> neg_inf_eq_sup
haftmann@25184
  1183
    neg_join_eq_meet        ~> neg_sup_eq_inf
haftmann@25184
  1184
    join_eq_if              ~> sup_eq_if
haftmann@25184
  1185
haftmann@25184
  1186
    mono_meet               ~> mono_inf
haftmann@25184
  1187
    mono_join               ~> mono_sup
haftmann@25184
  1188
    meet_bool_eq            ~> inf_bool_eq
haftmann@25184
  1189
    join_bool_eq            ~> sup_bool_eq
haftmann@25184
  1190
    meet_fun_eq             ~> inf_fun_eq
haftmann@25184
  1191
    join_fun_eq             ~> sup_fun_eq
haftmann@25184
  1192
    meet_set_eq             ~> inf_set_eq
haftmann@25184
  1193
    join_set_eq             ~> sup_set_eq
haftmann@25184
  1194
    meet1_iff               ~> inf1_iff
haftmann@25184
  1195
    meet2_iff               ~> inf2_iff
haftmann@25184
  1196
    meet1I                  ~> inf1I
haftmann@25184
  1197
    meet2I                  ~> inf2I
haftmann@25184
  1198
    meet1D1                 ~> inf1D1
haftmann@25184
  1199
    meet2D1                 ~> inf2D1
haftmann@25184
  1200
    meet1D2                 ~> inf1D2
haftmann@25184
  1201
    meet2D2                 ~> inf2D2
haftmann@25184
  1202
    meet1E                  ~> inf1E
haftmann@25184
  1203
    meet2E                  ~> inf2E
haftmann@25184
  1204
    join1_iff               ~> sup1_iff
haftmann@25184
  1205
    join2_iff               ~> sup2_iff
haftmann@25184
  1206
    join1I1                 ~> sup1I1
haftmann@25184
  1207
    join2I1                 ~> sup2I1
haftmann@25184
  1208
    join1I1                 ~> sup1I1
haftmann@25184
  1209
    join2I2                 ~> sup1I2
haftmann@25184
  1210
    join1CI                 ~> sup1CI
haftmann@25184
  1211
    join2CI                 ~> sup2CI
haftmann@25184
  1212
    join1E                  ~> sup1E
haftmann@25184
  1213
    join2E                  ~> sup2E
haftmann@25184
  1214
haftmann@25184
  1215
    is_meet_Meet            ~> is_meet_Inf
haftmann@25184
  1216
    Meet_bool_def           ~> Inf_bool_def
haftmann@25184
  1217
    Meet_fun_def            ~> Inf_fun_def
haftmann@25184
  1218
    Meet_greatest           ~> Inf_greatest
haftmann@25184
  1219
    Meet_lower              ~> Inf_lower
haftmann@25184
  1220
    Meet_set_def            ~> Inf_set_def
haftmann@25184
  1221
haftmann@25184
  1222
    Sup_def                 ~> Sup_Inf
haftmann@25184
  1223
    Sup_bool_eq             ~> Sup_bool_def
haftmann@25184
  1224
    Sup_fun_eq              ~> Sup_fun_def
haftmann@25184
  1225
    Sup_set_eq              ~> Sup_set_def
haftmann@25184
  1226
haftmann@25184
  1227
    listsp_meetI            ~> listsp_infI
haftmann@25184
  1228
    listsp_meet_eq          ~> listsp_inf_eq
haftmann@25184
  1229
haftmann@25184
  1230
    meet_min                ~> inf_min
haftmann@25184
  1231
    join_max                ~> sup_max
haftmann@25184
  1232
haftmann@25184
  1233
* Added syntactic class "size"; overloaded constant "size" now has
haftmann@25184
  1234
type "'a::size ==> bool"
haftmann@25184
  1235
wenzelm@24800
  1236
* Internal reorganisation of `size' of datatypes: size theorems
wenzelm@24800
  1237
"foo.size" are no longer subsumed by "foo.simps" (but are still
wenzelm@24800
  1238
simplification rules by default!); theorems "prod.size" now named
haftmann@25184
  1239
"*.size".
haftmann@25184
  1240
haftmann@25184
  1241
* Class "div" now inherits from class "times" rather than "type".
haftmann@25184
  1242
INCOMPATIBILITY.
wenzelm@24800
  1243
wenzelm@24800
  1244
* HOL/Finite_Set: "name-space" locales Lattice, Distrib_lattice,
wenzelm@24800
  1245
Linorder etc.  have disappeared; operations defined in terms of
wenzelm@24800
  1246
fold_set now are named Inf_fin, Sup_fin.  INCOMPATIBILITY.
wenzelm@24800
  1247
wenzelm@25129
  1248
* HOL/Nat: neq0_conv no longer declared as iff.  INCOMPATIBILITY.
wenzelm@25129
  1249
wenzelm@24800
  1250
* HOL-Word: New extensive library and type for generic, fixed size
wenzelm@24800
  1251
machine words, with arithemtic, bit-wise, shifting and rotating
wenzelm@24800
  1252
operations, reflection into int, nat, and bool lists, automation for
wenzelm@24800
  1253
linear arithmetic (by automatic reflection into nat or int), including
wenzelm@24800
  1254
lemmas on overflow and monotonicity.  Instantiated to all appropriate
wenzelm@24800
  1255
arithmetic type classes, supporting automatic simplification of
wenzelm@24800
  1256
numerals on all operations.
kleing@24333
  1257
kleing@24333
  1258
* Library/Boolean_Algebra: locales for abstract boolean algebras.
kleing@24333
  1259
kleing@24333
  1260
* Library/Numeral_Type: numbers as types, e.g. TYPE(32).
kleing@24333
  1261
haftmann@23850
  1262
* Code generator library theories:
haftmann@24993
  1263
  - Code_Integer represents HOL integers by big integer literals in target
haftmann@23850
  1264
    languages.
haftmann@24993
  1265
  - Code_Char represents HOL characters by character literals in target
haftmann@23850
  1266
    languages.
haftmann@24993
  1267
  - Code_Char_chr like Code_Char, but also offers treatment of character
haftmann@24993
  1268
    codes; includes Code_Integer.
wenzelm@24800
  1269
  - Executable_Set allows to generate code for finite sets using lists.
wenzelm@24800
  1270
  - Executable_Rat implements rational numbers as triples (sign, enumerator,
haftmann@23850
  1271
    denominator).
wenzelm@24800
  1272
  - Executable_Real implements a subset of real numbers, namly those
haftmann@23850
  1273
    representable by rational numbers.
wenzelm@24800
  1274
  - Efficient_Nat implements natural numbers by integers, which in general will
haftmann@23850
  1275
    result in higher efficency; pattern matching with 0/Suc is eliminated;
haftmann@24993
  1276
    includes Code_Integer.
haftmann@24993
  1277
  - Code_Index provides an additional datatype index which is mapped to
haftmann@24993
  1278
    target-language built-in integers.
haftmann@26355
  1279
  - Code_Message provides an additional datatype message_string which is isomorphic to
haftmann@24993
  1280
    strings; messages are mapped to target-language strings.
haftmann@23850
  1281
berghofe@23783
  1282
* New package for inductive predicates
berghofe@23783
  1283
berghofe@23783
  1284
  An n-ary predicate p with m parameters z_1, ..., z_m can now be defined via
berghofe@23783
  1285
berghofe@23783
  1286
    inductive
berghofe@23783
  1287
      p :: "U_1 => ... => U_m => T_1 => ... => T_n => bool"
berghofe@23783
  1288
      for z_1 :: U_1 and ... and z_n :: U_m
berghofe@23783
  1289
    where
berghofe@23783
  1290
      rule_1: "... ==> p z_1 ... z_m t_1_1 ... t_1_n"
berghofe@23783
  1291
    | ...
berghofe@23783
  1292
wenzelm@24800
  1293
  with full support for type-inference, rather than
berghofe@23783
  1294
berghofe@23783
  1295
    consts s :: "U_1 => ... => U_m => (T_1 * ... * T_n) set"
berghofe@23783
  1296
berghofe@23783
  1297
    abbreviation p :: "U_1 => ... => U_m => T_1 => ... => T_n => bool"
berghofe@23783
  1298
    where "p z_1 ... z_m x_1 ... x_n == (x_1, ..., x_n) : s z_1 ... z_m"
berghofe@23783
  1299
berghofe@23783
  1300
    inductive "s z_1 ... z_m"
berghofe@23783
  1301
    intros
berghofe@23783
  1302
      rule_1: "... ==> (t_1_1, ..., t_1_n) : s z_1 ... z_m"
berghofe@23783
  1303
      ...
berghofe@23783
  1304
berghofe@23783
  1305
  For backward compatibility, there is a wrapper allowing inductive
berghofe@23783
  1306
  sets to be defined with the new package via
berghofe@23783
  1307
berghofe@23783
  1308
    inductive_set
berghofe@23783
  1309
      s :: "U_1 => ... => U_m => (T_1 * ... * T_n) set"
berghofe@23783
  1310
      for z_1 :: U_1 and ... and z_n :: U_m
berghofe@23783
  1311
    where
berghofe@23783
  1312
      rule_1: "... ==> (t_1_1, ..., t_1_n) : s z_1 ... z_m"
berghofe@23783
  1313
    | ...
berghofe@23783
  1314
berghofe@23783
  1315
  or
berghofe@23783
  1316
berghofe@23783
  1317
    inductive_set
berghofe@23783
  1318
      s :: "U_1 => ... => U_m => (T_1 * ... * T_n) set"
berghofe@23783
  1319
      and p :: "U_1 => ... => U_m => T_1 => ... => T_n => bool"
berghofe@23783
  1320
      for z_1 :: U_1 and ... and z_n :: U_m
berghofe@23783
  1321
    where
berghofe@23783
  1322
      "p z_1 ... z_m x_1 ... x_n == (x_1, ..., x_n) : s z_1 ... z_m"
berghofe@23783
  1323
    | rule_1: "... ==> p z_1 ... z_m t_1_1 ... t_1_n"
berghofe@23783
  1324
    | ...
berghofe@23783
  1325
berghofe@23783
  1326
  if the additional syntax "p ..." is required.
berghofe@23783
  1327
wenzelm@25177
  1328
  Numerous examples can be found in the subdirectories src/HOL/Auth,
wenzelm@25177
  1329
  src/HOL/Bali, src/HOL/Induct, and src/HOL/MicroJava.
berghofe@23783
  1330
berghofe@23783
  1331
  INCOMPATIBILITIES:
berghofe@23783
  1332
berghofe@23783
  1333
  - Since declaration and definition of inductive sets or predicates
wenzelm@24800
  1334
    is no longer separated, abbreviations involving the newly
wenzelm@24800
  1335
    introduced sets or predicates must be specified together with the
wenzelm@24800
  1336
    introduction rules after the 'where' keyword (see above), rather
wenzelm@24800
  1337
    than before the actual inductive definition.
wenzelm@24800
  1338
wenzelm@24800
  1339
  - The variables in induction and elimination rules are now
wenzelm@24800
  1340
    quantified in the order of their occurrence in the introduction
wenzelm@24800
  1341
    rules, rather than in alphabetical order. Since this may break
wenzelm@24800
  1342
    some proofs, these proofs either have to be repaired, e.g. by
wenzelm@24800
  1343
    reordering the variables a_i_1 ... a_i_{k_i} in Isar 'case'
wenzelm@24800
  1344
    statements of the form
berghofe@23783
  1345
berghofe@23783
  1346
      case (rule_i a_i_1 ... a_i_{k_i})
berghofe@23783
  1347
berghofe@23783
  1348
    or the old order of quantification has to be restored by explicitly adding
berghofe@23783
  1349
    meta-level quantifiers in the introduction rules, i.e.
berghofe@23783
  1350
berghofe@23783
  1351
      | rule_i: "!!a_i_1 ... a_i_{k_i}. ... ==> p z_1 ... z_m t_i_1 ... t_i_n"
berghofe@23783
  1352
berghofe@23783
  1353
  - The format of the elimination rules is now
berghofe@23783
  1354
berghofe@23783
  1355
      p z_1 ... z_m x_1 ... x_n ==>
berghofe@23783
  1356
        (!!a_1_1 ... a_1_{k_1}. x_1 = t_1_1 ==> ... ==> x_n = t_1_n ==> ... ==> P)
berghofe@23783
  1357
        ==> ... ==> P
berghofe@23783
  1358
berghofe@23783
  1359
    for predicates and
berghofe@23783
  1360
berghofe@23783
  1361
      (x_1, ..., x_n) : s z_1 ... z_m ==>
berghofe@23783
  1362
        (!!a_1_1 ... a_1_{k_1}. x_1 = t_1_1 ==> ... ==> x_n = t_1_n ==> ... ==> P)
berghofe@23783
  1363
        ==> ... ==> P
berghofe@23783
  1364
berghofe@23783
  1365
    for sets rather than
berghofe@23783
  1366
berghofe@23783
  1367
      x : s z_1 ... z_m ==>
berghofe@23783
  1368
        (!!a_1_1 ... a_1_{k_1}. x = (t_1_1, ..., t_1_n) ==> ... ==> P)
berghofe@23783
  1369
        ==> ... ==> P
berghofe@23783
  1370
wenzelm@24800
  1371
    This may require terms in goals to be expanded to n-tuples
wenzelm@24800
  1372
    (e.g. using case_tac or simplification with the split_paired_all
wenzelm@24800
  1373
    rule) before the above elimination rule is applicable.
wenzelm@24800
  1374
wenzelm@24800
  1375
  - The elimination or case analysis rules for (mutually) inductive
wenzelm@24800
  1376
    sets or predicates are now called "p_1.cases" ... "p_k.cases". The
wenzelm@24800
  1377
    list of rules "p_1_..._p_k.elims" is no longer available.
berghofe@23783
  1378
krauss@25198
  1379
* New package "function"/"fun" for general recursive functions,
krauss@25198
  1380
supporting mutual and nested recursion, definitions in local contexts,
krauss@25198
  1381
more general pattern matching and partiality. See HOL/ex/Fundefs.thy
krauss@25198
  1382
for small examples, and the separate tutorial on the function
krauss@25198
  1383
package. The old recdef "package" is still available as before, but
krauss@25198
  1384
users are encouraged to use the new package.
krauss@25198
  1385
krauss@25198
  1386
* Method "lexicographic_order" automatically synthesizes termination
krauss@25198
  1387
relations as lexicographic combinations of size measures. 
krauss@25198
  1388
wenzelm@24800
  1389
* Case-expressions allow arbitrary constructor-patterns (including
wenzelm@24800
  1390
"_") and take their order into account, like in functional
wenzelm@24800
  1391
programming.  Internally, this is translated into nested
wenzelm@24800
  1392
case-expressions; missing cases are added and mapped to the predefined
wenzelm@24800
  1393
constant "undefined". In complicated cases printing may no longer show
wenzelm@24800
  1394
the original input but the internal form. Lambda-abstractions allow
wenzelm@24800
  1395
the same form of pattern matching: "% pat1 => e1 | ..." is an
wenzelm@24800
  1396
abbreviation for "%x. case x of pat1 => e1 | ..." where x is a new
wenzelm@24800
  1397
variable.
nipkow@23564
  1398
huffman@23468
  1399
* IntDef: The constant "int :: nat => int" has been removed; now "int"
wenzelm@24800
  1400
is an abbreviation for "of_nat :: nat => int". The simplification
wenzelm@24800
  1401
rules for "of_nat" have been changed to work like "int" did
wenzelm@24800
  1402
previously.  Potential INCOMPATIBILITY:
huffman@23468
  1403
  - "of_nat (Suc m)" simplifies to "1 + of_nat m" instead of "of_nat m + 1"
huffman@23468
  1404
  - of_nat_diff and of_nat_mult are no longer default simp rules
huffman@23377
  1405
chaieb@23295
  1406
* Method "algebra" solves polynomial equations over (semi)rings using
wenzelm@24800
  1407
Groebner bases. The (semi)ring structure is defined by locales and the
wenzelm@24800
  1408
tool setup depends on that generic context. Installing the method for
wenzelm@24800
  1409
a specific type involves instantiating the locale and possibly adding
wenzelm@24800
  1410
declarations for computation on the coefficients.  The method is
wenzelm@24800
  1411
already instantiated for natural numbers and for the axiomatic class
wenzelm@24800
  1412
of idoms with numerals.  See also the paper by Chaieb and Wenzel at
wenzelm@24800
  1413
CALCULEMUS 2007 for the general principles underlying this
wenzelm@24800
  1414
architecture of context-aware proof-tools.
wenzelm@24800
  1415
wenzelm@25033
  1416
* Method "ferrack" implements quantifier elimination over
wenzelm@25033
  1417
special-purpose dense linear orders using locales (analogous to
wenzelm@25033
  1418
"algebra"). The method is already installed for class
wenzelm@25033
  1419
{ordered_field,recpower,number_ring} which subsumes real, hyperreal,
wenzelm@25033
  1420
rat, etc.
wenzelm@25033
  1421
wenzelm@24800
  1422
* Former constant "List.op @" now named "List.append".  Use ML
wenzelm@24800
  1423
antiquotations @{const_name List.append} or @{term " ... @ ... "} to
wenzelm@24800
  1424
circumvent possible incompatibilities when working on ML level.
wenzelm@24800
  1425
haftmann@24996
  1426
* primrec: missing cases mapped to "undefined" instead of "arbitrary".
haftmann@22845
  1427
wenzelm@24800
  1428
* New function listsum :: 'a list => 'a for arbitrary monoids.
wenzelm@24800
  1429
Special syntax: "SUM x <- xs. f x" (and latex variants)
wenzelm@24800
  1430
wenzelm@24800
  1431
* New syntax for Haskell-like list comprehension (input only), eg.
wenzelm@25177
  1432
[(x,y). x <- xs, y <- ys, x ~= y], see also src/HOL/List.thy.
wenzelm@24800
  1433
wenzelm@24800
  1434
* The special syntax for function "filter" has changed from [x :
wenzelm@24800
  1435
xs. P] to [x <- xs. P] to avoid an ambiguity caused by list
wenzelm@24800
  1436
comprehension syntax, and for uniformity.  INCOMPATIBILITY.
wenzelm@24800
  1437
wenzelm@24800
  1438
* [a..b] is now defined for arbitrary linear orders.  It used to be
wenzelm@24800
  1439
defined on nat only, as an abbreviation for [a..<Suc b]
wenzelm@24800
  1440
INCOMPATIBILITY.
wenzelm@24800
  1441
wenzelm@24800
  1442
* Renamed lemma "set_take_whileD"  to "set_takeWhileD".
wenzelm@24800
  1443
wenzelm@25177
  1444
* New functions "sorted" and "sort" in src/HOL/List.thy.
wenzelm@24800
  1445
wenzelm@24800
  1446
* New lemma collection field_simps (an extension of ring_simps) for
wenzelm@24800
  1447
manipulating (in)equations involving division. Multiplies with all
wenzelm@24800
  1448
denominators that can be proved to be non-zero (in equations) or
wenzelm@24800
  1449
positive/negative (in inequations).
nipkow@23480
  1450
nipkow@23480
  1451
* Lemma collections ring_eq_simps, group_eq_simps and ring_distrib
wenzelm@24800
  1452
have been improved and renamed to ring_simps, group_simps and
wenzelm@24800
  1453
ring_distribs.  Removed lemmas field_xyz in theory Ring_and_Field
wenzelm@24800
  1454
because they were subsumed by lemmas xyz.  INCOMPATIBILITY.
wenzelm@24800
  1455
wenzelm@25177
  1456
* Theory Library/Commutative_Ring: switched from recdef to function
wenzelm@24800
  1457
package; constants add, mul, pow now curried.  Infix syntax for
wenzelm@24800
  1458
algebraic operations.
haftmann@22735
  1459
wenzelm@24800
  1460
* Dropped redundant lemma def_imp_eq in favor of meta_eq_to_obj_eq.
haftmann@22218
  1461
INCOMPATIBILITY.
haftmann@22218
  1462
wenzelm@24800
  1463
* Dropped redundant lemma if_def2 in favor of if_bool_eq_conj.
haftmann@22218
  1464
INCOMPATIBILITY.
haftmann@22218
  1465
wenzelm@22126
  1466
* HOL/records: generalised field-update to take a function on the
wenzelm@22126
  1467
field rather than the new value: r(|A := x|) is translated to A_update
wenzelm@22126
  1468
(K x) r The K-combinator that is internally used is called K_record.
schirmer@21226
  1469
INCOMPATIBILITY: Usage of the plain update functions has to be
schirmer@21226
  1470
adapted.
schirmer@21226
  1471
 
wenzelm@24800
  1472
* Class "semiring_0" now contains annihilation axioms x * 0 = 0 and 0
wenzelm@24800
  1473
* x = 0, which are required for a semiring.  Richer structures do not
wenzelm@24800
  1474
inherit from semiring_0 anymore, because this property is a theorem
wenzelm@24800
  1475
there, not an axiom.  INCOMPATIBILITY: In instances of semiring_0,
wenzelm@24800
  1476
there is more to prove, but this is mostly trivial.
wenzelm@24800
  1477
wenzelm@24800
  1478
* Class "recpower" is generalized to arbitrary monoids, not just
wenzelm@24800
  1479
commutative semirings.  INCOMPATIBILITY: may need to incorporate
haftmann@25163
  1480
commutativity or semiring properties additionally.
haftmann@21215
  1481
haftmann@21099
  1482
* Constant "List.list_all2" in List.thy now uses authentic syntax.
wenzelm@24800
  1483
INCOMPATIBILITY: translations containing list_all2 may go wrong,
wenzelm@24800
  1484
better use 'abbreviation'.
wenzelm@24800
  1485
wenzelm@24800
  1486
* Renamed constant "List.op mem" to "List.member".  INCOMPATIBILITY.
wenzelm@24800
  1487
wenzelm@22126
  1488
* Numeral syntax: type 'bin' which was a mere type copy of 'int' has
wenzelm@24800
  1489
been abandoned in favour of plain 'int'.  INCOMPATIBILITY --
wenzelm@22126
  1490
significant changes for setting up numeral syntax for types:
wenzelm@24800
  1491
  - New constants Numeral.pred and Numeral.succ instead
haftmann@20485
  1492
      of former Numeral.bin_pred and Numeral.bin_succ.
haftmann@20485
  1493
  - Use integer operations instead of bin_add, bin_mult and so on.
haftmann@20485
  1494
  - Numeral simplification theorems named Numeral.numeral_simps instead of Bin_simps.
haftmann@20485
  1495
  - ML structure Bin_Simprocs now named Int_Numeral_Base_Simprocs.
haftmann@20485
  1496
wenzelm@25177
  1497
See src/HOL/Integ/IntArith.thy for an example setup.
wenzelm@25177
  1498
wenzelm@25177
  1499
* Command 'normal_form' computes the normal form of a term that may
wenzelm@25177
  1500
contain free variables.  For example ``normal_form "rev [a, b, c]"''
wenzelm@25177
  1501
produces ``[b, c, a]'' (without proof).  This command is suitable for
wenzelm@25177
  1502
heavy-duty computations because the functions are compiled to ML
wenzelm@25177
  1503
first.  Correspondingly, a method "normalization" is provided.  See
wenzelm@25177
  1504
further src/HOL/ex/NormalForm.thy and src/Tools/nbe.ML.
nipkow@19895
  1505
wenzelm@17996
  1506
* Alternative iff syntax "A <-> B" for equality on bool (with priority
wenzelm@17996
  1507
25 like -->); output depends on the "iff" print_mode, the default is
wenzelm@17996
  1508
"A = B" (with priority 50).
wenzelm@17996
  1509
wenzelm@21265
  1510
* Relations less (<) and less_eq (<=) are also available on type bool.
wenzelm@21265
  1511
Modified syntax to disallow nesting without explicit parentheses,
wenzelm@24800
  1512
e.g. "(x < y) < z" or "x < (y < z)", but NOT "x < y < z".  Potential
wenzelm@24800
  1513
INCOMPATIBILITY.
wenzelm@21265
  1514
nipkow@18674
  1515
* "LEAST x:A. P" expands to "LEAST x. x:A & P" (input only).
nipkow@18674
  1516
krauss@20716
  1517
* Relation composition operator "op O" now has precedence 75 and binds
krauss@20716
  1518
stronger than union and intersection. INCOMPATIBILITY.
krauss@20716
  1519
wenzelm@22126
  1520
* The old set interval syntax "{m..n(}" (and relatives) has been
wenzelm@22126
  1521
removed.  Use "{m..<n}" (and relatives) instead.
nipkow@19377
  1522
wenzelm@17865
  1523
* In the context of the assumption "~(s = t)" the Simplifier rewrites
wenzelm@24800
  1524
"t = s" to False (by simproc "neq").  INCOMPATIBILITY, consider using
wenzelm@24800
  1525
``declare [[simproc del: neq]]''.
wenzelm@24800
  1526
wenzelm@24800
  1527
* Simplifier: "m dvd n" where m and n are numbers is evaluated to
wenzelm@24800
  1528
True/False.
wenzelm@24800
  1529
wenzelm@24800
  1530
* Theorem Cons_eq_map_conv no longer declared as "simp".
nipkow@19211
  1531
ballarin@19279
  1532
* Theorem setsum_mult renamed to setsum_right_distrib.
ballarin@19279
  1533
nipkow@19211
  1534
* Prefer ex1I over ex_ex1I in single-step reasoning, e.g. by the
wenzelm@22126
  1535
``rule'' method.
wenzelm@22126
  1536
wenzelm@24800
  1537
* Reimplemented methods "sat" and "satx", with several improvements:
wenzelm@24800
  1538
goals no longer need to be stated as "<prems> ==> False", equivalences
wenzelm@24800
  1539
(i.e. "=" on type bool) are handled, variable names of the form
wenzelm@24800
  1540
"lit_<n>" are no longer reserved, significant speedup.
wenzelm@24800
  1541
wenzelm@24800
  1542
* Methods "sat" and "satx" can now replay MiniSat proof traces.
wenzelm@22126
  1543
zChaff is still supported as well.
wenzelm@22126
  1544
wenzelm@22126
  1545
* 'inductive' and 'datatype': provide projections of mutual rules,
wenzelm@22126
  1546
bundled as foo_bar.inducts;
wenzelm@22126
  1547
wenzelm@22126
  1548
* Library: moved theories Parity, GCD, Binomial, Infinite_Set to
wenzelm@22126
  1549
Library.
wenzelm@21256
  1550
wenzelm@21256
  1551
* Library: moved theory Accessible_Part to main HOL.
wenzelm@19572
  1552
wenzelm@18446
  1553
* Library: added theory Coinductive_List of potentially infinite lists
wenzelm@18446
  1554
as greatest fixed-point.
wenzelm@18399
  1555
wenzelm@19254
  1556
* Library: added theory AssocList which implements (finite) maps as
schirmer@19252
  1557
association lists.
webertj@17809
  1558
wenzelm@24800
  1559
* Method "evaluation" solves goals (i.e. a boolean expression)
wenzelm@24800
  1560
efficiently by compiling it to ML.  The goal is "proved" (via an
wenzelm@24800
  1561
oracle) if it evaluates to True.
wenzelm@20807
  1562
wenzelm@20807
  1563
* Linear arithmetic now splits certain operators (e.g. min, max, abs)
wenzelm@24800
  1564
also when invoked by the simplifier.  This results in the Simplifier
wenzelm@24800
  1565
being more powerful on arithmetic goals.  INCOMPATIBILITY.
wenzelm@24800
  1566
Configuration option fast_arith_split_limit=0 recovers the old
wenzelm@24800
  1567
behavior.
webertj@20217
  1568
wenzelm@22126
  1569
* Support for hex (0x20) and binary (0b1001) numerals.
wenzelm@19254
  1570
wenzelm@20807
  1571
* New method: reify eqs (t), where eqs are equations for an
wenzelm@20807
  1572
interpretation I :: 'a list => 'b => 'c and t::'c is an optional
wenzelm@20807
  1573
parameter, computes a term s::'b and a list xs::'a list and proves the
wenzelm@20807
  1574
theorem I xs s = t. This is also known as reification or quoting. The
wenzelm@20807
  1575
resulting theorem is applied to the subgoal to substitute t with I xs
wenzelm@20807
  1576
s.  If t is omitted, the subgoal itself is reified.
wenzelm@20807
  1577
wenzelm@20807
  1578
* New method: reflection corr_thm eqs (t). The parameters eqs and (t)
wenzelm@20807
  1579
are as explained above. corr_thm is a theorem for I vs (f t) = I vs t,
wenzelm@20807
  1580
where f is supposed to be a computable function (in the sense of code
wenzelm@20807
  1581
generattion). The method uses reify to compute s and xs as above then
wenzelm@20807
  1582
applies corr_thm and uses normalization by evaluation to "prove" f s =
wenzelm@20807
  1583
r and finally gets the theorem t = r, which is again applied to the
wenzelm@25177
  1584
subgoal. An Example is available in src/HOL/ex/ReflectionEx.thy.
wenzelm@25177
  1585
wenzelm@25177
  1586
* Reflection: Automatic reification now handels binding, an example is
wenzelm@25177
  1587
available in src/HOL/ex/ReflectionEx.thy
wenzelm@20807
  1588
wenzelm@25397
  1589
* HOL-Statespace: ``State Spaces: The Locale Way'' introduces a
schirmer@25409
  1590
command 'statespace' that is similar to 'record', but introduces an
wenzelm@25397
  1591
abstract specification based on the locale infrastructure instead of
wenzelm@25397
  1592
HOL types.  This leads to extra flexibility in composing state spaces,
wenzelm@25397
  1593
in particular multiple inheritance and renaming of components.
wenzelm@25397
  1594
wenzelm@25397
  1595
wenzelm@19653
  1596
*** HOL-Complex ***
wenzelm@19653
  1597
huffman@22971
  1598
* Hyperreal: Functions root and sqrt are now defined on negative real
huffman@22971
  1599
inputs so that root n (- x) = - root n x and sqrt (- x) = - sqrt x.
huffman@22971
  1600
Nonnegativity side conditions have been removed from many lemmas, so
huffman@22971
  1601
that more subgoals may now be solved by simplification; potential
huffman@22971
  1602
INCOMPATIBILITY.
huffman@22971
  1603
wenzelm@24800
  1604
* Real: new type classes formalize real normed vector spaces and
huffman@21791
  1605
algebras, using new overloaded constants scaleR :: real => 'a => 'a
huffman@21791
  1606
and norm :: 'a => real.
huffman@21791
  1607
wenzelm@24800
  1608
* Real: constant of_real :: real => 'a::real_algebra_1 injects from
wenzelm@24800
  1609
reals into other types. The overloaded constant Reals :: 'a set is now
wenzelm@24800
  1610
defined as range of_real; potential INCOMPATIBILITY.
wenzelm@24800
  1611
wenzelm@24800
  1612
* Real: proper support for ML code generation, including 'quickcheck'.
nipkow@23013
  1613
Reals are implemented as arbitrary precision rationals.
nipkow@23013
  1614
wenzelm@22126
  1615
* Hyperreal: Several constants that previously worked only for the
wenzelm@22126
  1616
reals have been generalized, so they now work over arbitrary vector
wenzelm@22126
  1617
spaces. Type annotations may need to be added in some cases; potential
wenzelm@22126
  1618
INCOMPATIBILITY.
huffman@21791
  1619
huffman@22972
  1620
  Infinitesimal  :: ('a::real_normed_vector) star set
huffman@22972
  1621
  HFinite        :: ('a::real_normed_vector) star set
huffman@22972
  1622
  HInfinite      :: ('a::real_normed_vector) star set
huffman@21791
  1623
  approx         :: ('a::real_normed_vector) star => 'a star => bool
huffman@21791
  1624
  monad          :: ('a::real_normed_vector) star => 'a star set
huffman@21791
  1625
  galaxy         :: ('a::real_normed_vector) star => 'a star set
huffman@22972
  1626
  (NS)LIMSEQ     :: [nat => 'a::real_normed_vector, 'a] => bool
huffman@21791
  1627
  (NS)convergent :: (nat => 'a::real_normed_vector) => bool
huffman@21791
  1628
  (NS)Bseq       :: (nat => 'a::real_normed_vector) => bool
huffman@21791
  1629
  (NS)Cauchy     :: (nat => 'a::real_normed_vector) => bool
huffman@21791
  1630
  (NS)LIM        :: ['a::real_normed_vector => 'b::real_normed_vector, 'a, 'b] => bool
huffman@21791
  1631
  is(NS)Cont     :: ['a::real_normed_vector => 'b::real_normed_vector, 'a] => bool
huffman@21791
  1632
  deriv          :: ['a::real_normed_field => 'a, 'a, 'a] => bool
huffman@22972
  1633
  sgn            :: 'a::real_normed_vector => 'a
huffman@23116
  1634
  exp            :: 'a::{recpower,real_normed_field,banach} => 'a
huffman@21791
  1635
huffman@21791
  1636
* Complex: Some complex-specific constants are now abbreviations for
wenzelm@22126
  1637
overloaded ones: complex_of_real = of_real, cmod = norm, hcmod =
wenzelm@22126
  1638
hnorm.  Other constants have been entirely removed in favor of the
wenzelm@22126
  1639
polymorphic versions (INCOMPATIBILITY):
huffman@21791
  1640
huffman@21791
  1641
  approx        <-- capprox
huffman@21791
  1642
  HFinite       <-- CFinite
huffman@21791
  1643
  HInfinite     <-- CInfinite
huffman@21791
  1644
  Infinitesimal <-- CInfinitesimal
huffman@21791
  1645
  monad         <-- cmonad
huffman@21791
  1646
  galaxy        <-- cgalaxy
huffman@21791
  1647
  (NS)LIM       <-- (NS)CLIM, (NS)CRLIM
huffman@21791
  1648
  is(NS)Cont    <-- is(NS)Contc, is(NS)contCR
huffman@21791
  1649
  (ns)deriv     <-- (ns)cderiv
huffman@21791
  1650
wenzelm@19653
  1651
wenzelm@24801
  1652
*** HOL-Algebra ***
wenzelm@24801
  1653
wenzelm@24801
  1654
* Formalisation of ideals and the quotient construction over rings.
wenzelm@24801
  1655
wenzelm@24801
  1656
* Order and lattice theory no longer based on records.
wenzelm@24801
  1657
INCOMPATIBILITY.
wenzelm@24801
  1658
wenzelm@24801
  1659
* Renamed lemmas least_carrier -> least_closed and greatest_carrier ->
wenzelm@24801
  1660
greatest_closed.  INCOMPATIBILITY.
wenzelm@24801
  1661
wenzelm@24801
  1662
* Method algebra is now set up via an attribute.  For examples see
wenzelm@24801
  1663
Ring.thy.  INCOMPATIBILITY: the method is now weaker on combinations
wenzelm@24801
  1664
of algebraic structures.
wenzelm@24801
  1665
wenzelm@24801
  1666
* Renamed theory CRing to Ring.
wenzelm@24801
  1667
wenzelm@24801
  1668
wenzelm@24801
  1669
*** HOL-Nominal ***
wenzelm@24801
  1670
wenzelm@25148
  1671
* Substantial, yet incomplete support for nominal datatypes (binding
wenzelm@25177
  1672
structures) based on HOL-Nominal logic.  See src/HOL/Nominal and
wenzelm@25177
  1673
src/HOL/Nominal/Examples.  Prospective users should consult
wenzelm@25148
  1674
http://isabelle.in.tum.de/nominal/
wenzelm@25148
  1675
wenzelm@24801
  1676
wenzelm@17878
  1677
*** ML ***
wenzelm@17878
  1678
wenzelm@24643
  1679
* ML basics: just one true type int, which coincides with IntInf.int
wenzelm@24643
  1680
(even on SML/NJ).
wenzelm@24643
  1681
wenzelm@22138
  1682
* ML within Isar: antiquotations allow to embed statically-checked
wenzelm@22138
  1683
formal entities in the source, referring to the context available at
wenzelm@22138
  1684
compile-time.  For example:
wenzelm@22138
  1685
wenzelm@25142
  1686
ML {* @{sort "{zero,one}"} *}
wenzelm@22138
  1687
ML {* @{typ "'a => 'b"} *}
wenzelm@22138
  1688
ML {* @{term "%x. x"} *}
wenzelm@22138
  1689
ML {* @{prop "x == y"} *}
wenzelm@22138
  1690
ML {* @{ctyp "'a => 'b"} *}
wenzelm@22138
  1691
ML {* @{cterm "%x. x"} *}
wenzelm@22138
  1692
ML {* @{cprop "x == y"} *}
wenzelm@22138
  1693
ML {* @{thm asm_rl} *}
wenzelm@22138
  1694
ML {* @{thms asm_rl} *}
wenzelm@24692
  1695
ML {* @{type_name c} *}
wenzelm@25142
  1696
ML {* @{type_syntax c} *}
wenzelm@22376
  1697
ML {* @{const_name c} *}
wenzelm@22376
  1698
ML {* @{const_syntax c} *}
wenzelm@22138
  1699
ML {* @{context} *}
wenzelm@22138
  1700
ML {* @{theory} *}
wenzelm@22138
  1701
ML {* @{theory Pure} *}
wenzelm@24692
  1702
ML {* @{theory_ref} *}
wenzelm@24692
  1703
ML {* @{theory_ref Pure} *}
wenzelm@22138
  1704
ML {* @{simpset} *}
wenzelm@22138
  1705
ML {* @{claset} *}
wenzelm@22138
  1706
ML {* @{clasimpset} *}
wenzelm@22138
  1707
wenzelm@22151
  1708
The same works for sources being ``used'' within an Isar context.
wenzelm@22151
  1709
wenzelm@22152
  1710
* ML in Isar: improved error reporting; extra verbosity with
wenzelm@24706
  1711
ML_Context.trace enabled.
wenzelm@22152
  1712
wenzelm@19032
  1713
* Pure/General/table.ML: the join operations now works via exceptions
wenzelm@24706
  1714
DUP/SAME instead of type option. This is simpler in simple cases, and
wenzelm@19081
  1715
admits slightly more efficient complex applications.
wenzelm@18446
  1716
wenzelm@24800
  1717
* Pure: 'advanced' translation functions (parse_translation etc.) now
wenzelm@24800
  1718
use Context.generic instead of just theory.
wenzelm@24800
  1719
wenzelm@18642
  1720
* Pure: datatype Context.generic joins theory/Proof.context and
wenzelm@18644
  1721
provides some facilities for code that works in either kind of
wenzelm@18642
  1722
context, notably GenericDataFun for uniform theory and proof data.
wenzelm@18642
  1723
wenzelm@18737
  1724
* Pure: simplified internal attribute type, which is now always
wenzelm@24706
  1725
Context.generic * thm -> Context.generic * thm. Global (theory) vs.
wenzelm@24706
  1726
local (Proof.context) attributes have been discontinued, while
wenzelm@24706
  1727
minimizing code duplication. Thm.rule_attribute and
wenzelm@24706
  1728
Thm.declaration_attribute build canonical attributes; see also structure
wenzelm@24706
  1729
Context for further operations on Context.generic, notably
wenzelm@24706
  1730
GenericDataFun. INCOMPATIBILITY, need to adapt attribute type
wenzelm@19006
  1731
declarations and definitions.
wenzelm@19006
  1732
wenzelm@24800
  1733
* Context data interfaces (Theory/Proof/GenericDataFun): removed
wenzelm@24800
  1734
name/print, uninitialized data defaults to ad-hoc copy of empty value,
wenzelm@24800
  1735
init only required for impure data. INCOMPATIBILITY: empty really need
wenzelm@24800
  1736
to be empty (no dependencies on theory content!)
wenzelm@24800
  1737
wenzelm@19508
  1738
* Pure/kernel: consts certification ignores sort constraints given in
wenzelm@24800
  1739
signature declarations. (This information is not relevant to the
wenzelm@24800
  1740
logic, but only for type inference.) SIGNIFICANT INTERNAL CHANGE,
wenzelm@24800
  1741
potential INCOMPATIBILITY.
wenzelm@19508
  1742
wenzelm@19508
  1743
* Pure: axiomatic type classes are now purely definitional, with
wenzelm@19508
  1744
explicit proofs of class axioms and super class relations performed
wenzelm@24706
  1745
internally. See Pure/axclass.ML for the main internal interfaces --
wenzelm@19508
  1746
notably AxClass.define_class supercedes AxClass.add_axclass, and
wenzelm@24706
  1747
AxClass.axiomatize_class/classrel/arity supersede
wenzelm@19508
  1748
Sign.add_classes/classrel/arities.
wenzelm@19508
  1749
wenzelm@19006
  1750
* Pure/Isar: Args/Attrib parsers operate on Context.generic --
wenzelm@19006
  1751
global/local versions on theory vs. Proof.context have been
wenzelm@19006
  1752
discontinued; Attrib.syntax and Method.syntax have been adapted
wenzelm@19006
  1753
accordingly.  INCOMPATIBILITY, need to adapt parser expressions for
wenzelm@19006
  1754
attributes, methods, etc.
wenzelm@18642
  1755
wenzelm@18446
  1756
* Pure: several functions of signature "... -> theory -> theory * ..."
wenzelm@18446
  1757
have been reoriented to "... -> theory -> ... * theory" in order to
wenzelm@18446
  1758
allow natural usage in combination with the ||>, ||>>, |-> and
wenzelm@18446
  1759
fold_map combinators.
haftmann@18051
  1760
wenzelm@21647
  1761
* Pure: official theorem names (closed derivations) and additional
wenzelm@21647
  1762
comments (tags) are now strictly separate.  Name hints -- which are
wenzelm@21647
  1763
maintained as tags -- may be attached any time without affecting the
wenzelm@21647
  1764
derivation.
wenzelm@21647
  1765
wenzelm@18020
  1766
* Pure: primitive rule lift_rule now takes goal cterm instead of an
wenzelm@18145
  1767
actual goal state (thm).  Use Thm.lift_rule (Thm.cprem_of st i) to
wenzelm@18020
  1768
achieve the old behaviour.
wenzelm@18020
  1769
wenzelm@18020
  1770
* Pure: the "Goal" constant is now called "prop", supporting a
wenzelm@18020
  1771
slightly more general idea of ``protecting'' meta-level rule
wenzelm@18020
  1772
statements.
wenzelm@18020
  1773
wenzelm@20040
  1774
* Pure: Logic.(un)varify only works in a global context, which is now
wenzelm@20040
  1775
enforced instead of silently assumed.  INCOMPATIBILITY, may use
wenzelm@20040
  1776
Logic.legacy_(un)varify as temporary workaround.
wenzelm@20040
  1777
wenzelm@20090
  1778
* Pure: structure Name provides scalable operations for generating
wenzelm@20090
  1779
internal variable names, notably Name.variants etc.  This replaces
wenzelm@20090
  1780
some popular functions from term.ML:
wenzelm@20090
  1781
wenzelm@20090
  1782
  Term.variant		->  Name.variant
wenzelm@24800
  1783
  Term.variantlist	->  Name.variant_list
wenzelm@20090
  1784
  Term.invent_names	->  Name.invent_list
wenzelm@20090
  1785
wenzelm@20090
  1786
Note that low-level renaming rarely occurs in new code -- operations
wenzelm@20090
  1787
from structure Variable are used instead (see below).
wenzelm@20090
  1788
wenzelm@20040
  1789
* Pure: structure Variable provides fundamental operations for proper
wenzelm@20040
  1790
treatment of fixed/schematic variables in a context.  For example,
wenzelm@20040
  1791
Variable.import introduces fixes for schematics of given facts and
wenzelm@20040
  1792
Variable.export reverses the effect (up to renaming) -- this replaces
wenzelm@20040
  1793
various freeze_thaw operations.
wenzelm@20040
  1794
wenzelm@18567
  1795
* Pure: structure Goal provides simple interfaces for
wenzelm@17981
  1796
init/conclude/finish and tactical prove operations (replacing former
wenzelm@20040
  1797
Tactic.prove).  Goal.prove is the canonical way to prove results
wenzelm@20040
  1798
within a given context; Goal.prove_global is a degraded version for
wenzelm@20040
  1799
theory level goals, including a global Drule.standard.  Note that
wenzelm@20040
  1800
OldGoals.prove_goalw_cterm has long been obsolete, since it is
wenzelm@20040
  1801
ill-behaved in a local proof context (e.g. with local fixes/assumes or
wenzelm@20040
  1802
in a locale context).
wenzelm@17981
  1803
wenzelm@24706
  1804
* Pure/Syntax: generic interfaces for parsing (Syntax.parse_term etc.)
wenzelm@24706
  1805
and type checking (Syntax.check_term etc.), with common combinations
wenzelm@24706
  1806
(Syntax.read_term etc.). These supersede former Sign.read_term etc.
wenzelm@24706
  1807
which are considered legacy and await removal.
wenzelm@24706
  1808
wenzelm@24920
  1809
* Pure/Syntax: generic interfaces for type unchecking
wenzelm@24920
  1810
(Syntax.uncheck_terms etc.) and unparsing (Syntax.unparse_term etc.),
wenzelm@24920
  1811
with common combinations (Syntax.pretty_term, Syntax.string_of_term
wenzelm@24920
  1812
etc.).  Former Sign.pretty_term, Sign.string_of_term etc. are still
wenzelm@24924
  1813
available for convenience, but refer to the very same operations using
wenzelm@24924
  1814
a mere theory instead of a full context.
wenzelm@24920
  1815
wenzelm@18815
  1816
* Isar: simplified treatment of user-level errors, using exception
wenzelm@18687
  1817
ERROR of string uniformly.  Function error now merely raises ERROR,
wenzelm@18686
  1818
without any side effect on output channels.  The Isar toplevel takes
wenzelm@18686
  1819
care of proper display of ERROR exceptions.  ML code may use plain
wenzelm@18686
  1820
handle/can/try; cat_error may be used to concatenate errors like this:
wenzelm@18686
  1821
wenzelm@18686
  1822
  ... handle ERROR msg => cat_error msg "..."
wenzelm@18686
  1823
wenzelm@18686
  1824
Toplevel ML code (run directly or through the Isar toplevel) may be
wenzelm@18687
  1825
embedded into the Isar toplevel with exception display/debug like
wenzelm@18687
  1826
this:
wenzelm@18686
  1827
wenzelm@18686
  1828
  Isar.toplevel (fn () => ...)
wenzelm@18686
  1829
wenzelm@18686
  1830
INCOMPATIBILITY, removed special transform_error facilities, removed
wenzelm@18686
  1831
obsolete variants of user-level exceptions (ERROR_MESSAGE,
wenzelm@18686
  1832
Context.PROOF, ProofContext.CONTEXT, Proof.STATE, ProofHistory.FAIL)
wenzelm@18686
  1833
-- use plain ERROR instead.
wenzelm@18686
  1834
wenzelm@18815
  1835
* Isar: theory setup now has type (theory -> theory), instead of a
wenzelm@18722
  1836
list.  INCOMPATIBILITY, may use #> to compose setup functions.
wenzelm@18722
  1837
wenzelm@24706
  1838
* Isar: ML toplevel pretty printer for type Proof.context, subject to
wenzelm@24706
  1839
ProofContext.debug/verbose flags.
wenzelm@18815
  1840
wenzelm@18815
  1841
* Isar: Toplevel.theory_to_proof admits transactions that modify the
wenzelm@18815
  1842
theory before entering a proof state.  Transactions now always see a
wenzelm@18815
  1843
quasi-functional intermediate checkpoint, both in interactive and
wenzelm@18590
  1844
batch mode.
wenzelm@18567
  1845
wenzelm@24867
  1846
* Isar: simplified interfaces for outer syntax.  Renamed
wenzelm@24867
  1847
OuterSyntax.add_keywords to OuterSyntax.keywords.  Removed
wenzelm@24867
  1848
OuterSyntax.add_parsers -- this functionality is now included in
wenzelm@24867
  1849
OuterSyntax.command etc.  INCOMPATIBILITY.
wenzelm@24867
  1850
wenzelm@17878
  1851
* Simplifier: the simpset of a running simplification process now
wenzelm@17878
  1852
contains a proof context (cf. Simplifier.the_context), which is the
wenzelm@17878
  1853
very context that the initial simpset has been retrieved from (by
wenzelm@17890
  1854
simpset_of/local_simpset_of).  Consequently, all plug-in components
wenzelm@17878
  1855
(solver, looper etc.) may depend on arbitrary proof data.
wenzelm@17878
  1856
wenzelm@17878
  1857
* Simplifier.inherit_context inherits the proof context (plus the
wenzelm@17878
  1858
local bounds) of the current simplification process; any simproc
wenzelm@17878
  1859
etc. that calls the Simplifier recursively should do this!  Removed
wenzelm@17878
  1860
former Simplifier.inherit_bounds, which is already included here --
wenzelm@17890
  1861
INCOMPATIBILITY.  Tools based on low-level rewriting may even have to
wenzelm@17890
  1862
specify an explicit context using Simplifier.context/theory_context.
wenzelm@17878
  1863
wenzelm@17878
  1864
* Simplifier/Classical Reasoner: more abstract interfaces
wenzelm@17878
  1865
change_simpset/claset for modifying the simpset/claset reference of a
wenzelm@17878
  1866
theory; raw versions simpset/claset_ref etc. have been discontinued --
wenzelm@17878
  1867
INCOMPATIBILITY.
wenzelm@17878
  1868
wenzelm@18540
  1869
* Provers: more generic wrt. syntax of object-logics, avoid hardwired
wenzelm@18540
  1870
"Trueprop" etc.
wenzelm@18540
  1871
wenzelm@17878
  1872
wenzelm@20988
  1873
*** System ***
wenzelm@20988
  1874
wenzelm@25433
  1875
* settings: the default heap location within ISABELLE_HOME_USER now
wenzelm@25433
  1876
includes ISABELLE_IDENTIFIER.  This simplifies use of multiple
wenzelm@25433
  1877
Isabelle installations.
wenzelm@21471
  1878
wenzelm@20988
  1879
* isabelle-process: option -S (secure mode) disables some critical
wenzelm@20988
  1880
operations, notably runtime compilation and evaluation of ML source
wenzelm@20988
  1881
code.
wenzelm@20988
  1882
wenzelm@24891
  1883
* Basic Isabelle mode for jEdit, see Isabelle/lib/jedit/.
wenzelm@24891
  1884
wenzelm@24801
  1885
* Support for parallel execution, using native multicore support of
wenzelm@24800
  1886
Poly/ML 5.1.  The theory loader exploits parallelism when processing
wenzelm@24800
  1887
independent theories, according to the given theory header
wenzelm@24800
  1888
specifications. The maximum number of worker threads is specified via
wenzelm@24800
  1889
usedir option -M or the "max-threads" setting in Proof General. A
wenzelm@24800
  1890
speedup factor of 1.5--3.5 can be expected on a 4-core machine, and up
wenzelm@24800
  1891
to 6 on a 8-core machine.  User-code needs to observe certain
wenzelm@24800
  1892
guidelines for thread-safe programming, see appendix A in the Isar
wenzelm@24800
  1893
Implementation manual.
wenzelm@24210
  1894
wenzelm@17754
  1895
wenzelm@25448
  1896
wenzelm@17720
  1897
New in Isabelle2005 (October 2005)
wenzelm@17720
  1898
----------------------------------
wenzelm@14655
  1899
wenzelm@14655
  1900
*** General ***
wenzelm@14655
  1901
nipkow@15130
  1902
* Theory headers: the new header syntax for Isar theories is
nipkow@15130
  1903
nipkow@15130
  1904
  theory <name>
wenzelm@16234
  1905
  imports <theory1> ... <theoryN>
wenzelm@16234
  1906
  uses <file1> ... <fileM>
nipkow@15130
  1907
  begin
nipkow@15130
  1908
wenzelm@16234
  1909
where the 'uses' part is optional.  The previous syntax
wenzelm@16234
  1910
wenzelm@16234
  1911
  theory <name> = <theory1> + ... + <theoryN>:
wenzelm@16234
  1912
wenzelm@16717
  1913
will disappear in the next release.  Use isatool fixheaders to convert
wenzelm@16717
  1914
existing theory files.  Note that there is no change in ancient
wenzelm@17371
  1915
non-Isar theories now, but these will disappear soon.
nipkow@15130
  1916
berghofe@15475
  1917
* Theory loader: parent theories can now also be referred to via
wenzelm@16234
  1918
relative and absolute paths.
wenzelm@16234
  1919
wenzelm@17408
  1920
* Command 'find_theorems' searches for a list of criteria instead of a
wenzelm@17408
  1921
list of constants. Known criteria are: intro, elim, dest, name:string,
wenzelm@17408
  1922
simp:term, and any term. Criteria can be preceded by '-' to select
wenzelm@17408
  1923
theorems that do not match. Intro, elim, dest select theorems that
wenzelm@17408
  1924
match the current goal, name:s selects theorems whose fully qualified
wenzelm@17408
  1925
name contain s, and simp:term selects all simplification rules whose
wenzelm@17408
  1926
lhs match term.  Any other term is interpreted as pattern and selects
wenzelm@17408
  1927
all theorems matching the pattern. Available in ProofGeneral under
wenzelm@17408
  1928
'ProofGeneral -> Find Theorems' or C-c C-f.  Example:
wenzelm@16234
  1929
wenzelm@17275
  1930
  C-c C-f (100) "(_::nat) + _ + _" intro -name: "HOL."
wenzelm@16234
  1931
wenzelm@16234
  1932
prints the last 100 theorems matching the pattern "(_::nat) + _ + _",
wenzelm@16234
  1933
matching the current goal as introduction rule and not having "HOL."
wenzelm@16234
  1934
in their name (i.e. not being defined in theory HOL).
wenzelm@16013
  1935
wenzelm@17408
  1936
* Command 'thms_containing' has been discontinued in favour of
wenzelm@17408
  1937
'find_theorems'; INCOMPATIBILITY.
wenzelm@17408
  1938
wenzelm@17385
  1939
* Communication with Proof General is now 8bit clean, which means that
wenzelm@17385
  1940
Unicode text in UTF-8 encoding may be used within theory texts (both
wenzelm@17408
  1941
formal and informal parts).  Cf. option -U of the Isabelle Proof
wenzelm@17538
  1942
General interface.  Here are some simple examples (cf. src/HOL/ex):
wenzelm@17538
  1943
wenzelm@17538
  1944
  http://isabelle.in.tum.de/library/HOL/ex/Hebrew.html
wenzelm@17538
  1945
  http://isabelle.in.tum.de/library/HOL/ex/Chinese.html
wenzelm@17385
  1946
wenzelm@17425
  1947
* Improved efficiency of the Simplifier and, to a lesser degree, the
wenzelm@17425
  1948
Classical Reasoner.  Typical big applications run around 2 times
wenzelm@17425
  1949
faster.
wenzelm@17425
  1950
wenzelm@15703
  1951
wenzelm@15703
  1952
*** Document preparation ***
wenzelm@15703
  1953
wenzelm@16234
  1954
* Commands 'display_drafts' and 'print_drafts' perform simple output
wenzelm@16234
  1955
of raw sources.  Only those symbols that do not require additional
wenzelm@16234
  1956
LaTeX packages (depending on comments in isabellesym.sty) are
wenzelm@16234
  1957
displayed properly, everything else is left verbatim.  isatool display
wenzelm@16234
  1958
and isatool print are used as front ends (these are subject to the
wenzelm@16234
  1959
DVI/PDF_VIEWER and PRINT_COMMAND settings, respectively).
wenzelm@16234
  1960
wenzelm@17047
  1961
* Command tags control specific markup of certain regions of text,
wenzelm@17047
  1962
notably folding and hiding.  Predefined tags include "theory" (for
wenzelm@17047
  1963
theory begin and end), "proof" for proof commands, and "ML" for
wenzelm@17047
  1964
commands involving ML code; the additional tags "visible" and
wenzelm@17047
  1965
"invisible" are unused by default.  Users may give explicit tag
wenzelm@17047
  1966
specifications in the text, e.g. ''by %invisible (auto)''.  The
wenzelm@17047
  1967
interpretation of tags is determined by the LaTeX job during document
wenzelm@17047
  1968
preparation: see option -V of isatool usedir, or options -n and -t of
wenzelm@17047
  1969
isatool document, or even the LaTeX macros \isakeeptag, \isafoldtag,
wenzelm@17047
  1970
\isadroptag.
wenzelm@17047
  1971
wenzelm@17047
  1972
Several document versions may be produced at the same time via isatool
wenzelm@17047
  1973
usedir (the generated index.html will link all of them).  Typical
wenzelm@17047
  1974
specifications include ''-V document=theory,proof,ML'' to present
wenzelm@17047
  1975
theory/proof/ML parts faithfully, ''-V outline=/proof,/ML'' to fold
wenzelm@17047
  1976
proof and ML commands, and ''-V mutilated=-theory,-proof,-ML'' to omit
wenzelm@17047
  1977
these parts without any formal replacement text.  The Isabelle site
wenzelm@17047
  1978
default settings produce ''document'' and ''outline'' versions as
wenzelm@17047
  1979
specified above.
wenzelm@16234
  1980
haftmann@17402
  1981
* Several new antiquotations:
wenzelm@15979
  1982
wenzelm@15979
  1983
  @{term_type term} prints a term with its type annotated;
wenzelm@15979
  1984
wenzelm@15979
  1985
  @{typeof term} prints the type of a term;
wenzelm@15979
  1986
wenzelm@16234
  1987
  @{const const} is the same as @{term const}, but checks that the
wenzelm@16234
  1988
  argument is a known logical constant;
wenzelm@15979
  1989
wenzelm@15979
  1990
  @{term_style style term} and @{thm_style style thm} print a term or
wenzelm@16234
  1991
  theorem applying a "style" to it
wenzelm@16234
  1992
wenzelm@17117
  1993
  @{ML text}
wenzelm@17117
  1994
wenzelm@16234
  1995
Predefined styles are 'lhs' and 'rhs' printing the lhs/rhs of
wenzelm@16234
  1996
definitions, equations, inequations etc., 'concl' printing only the
schirmer@17393
  1997
conclusion of a meta-logical statement theorem, and 'prem1' .. 'prem19'
wenzelm@16234
  1998
to print the specified premise.  TermStyle.add_style provides an ML
wenzelm@16234
  1999
interface for introducing further styles.  See also the "LaTeX Sugar"
wenzelm@17117
  2000
document practical applications.  The ML antiquotation prints
wenzelm@17117
  2001
type-checked ML expressions verbatim.
wenzelm@16234
  2002
wenzelm@17259
  2003
* Markup commands 'chapter', 'section', 'subsection', 'subsubsection',
wenzelm@17259
  2004
and 'text' support optional locale specification '(in loc)', which
wenzelm@17269
  2005
specifies the default context for interpreting antiquotations.  For
wenzelm@17269
  2006
example: 'text (in lattice) {* @{thm inf_assoc}*}'.
wenzelm@17259
  2007
wenzelm@17259
  2008
* Option 'locale=NAME' of antiquotations specifies an alternative
wenzelm@17259
  2009
context interpreting the subsequent argument.  For example: @{thm
wenzelm@17269
  2010
[locale=lattice] inf_assoc}.
wenzelm@17259
  2011
wenzelm@17097
  2012
* Proper output of proof terms (@{prf ...} and @{full_prf ...}) within
wenzelm@17097
  2013
a proof context.
wenzelm@17097
  2014
wenzelm@17097
  2015
* Proper output of antiquotations for theory commands involving a
wenzelm@17097
  2016
proof context (such as 'locale' or 'theorem (in loc) ...').
wenzelm@17097
  2017
wenzelm@17193
  2018
* Delimiters of outer tokens (string etc.) now produce separate LaTeX
wenzelm@17193
  2019
macros (\isachardoublequoteopen, isachardoublequoteclose etc.).
wenzelm@17193
  2020
wenzelm@17193
  2021
* isatool usedir: new option -C (default true) controls whether option
wenzelm@17193
  2022
-D should include a copy of the original document directory; -C false
wenzelm@17193
  2023
prevents unwanted effects such as copying of administrative CVS data.
wenzelm@17193
  2024
wenzelm@16234
  2025
wenzelm@16234
  2026
*** Pure ***
wenzelm@16234
  2027
wenzelm@16234
  2028
* Considerably improved version of 'constdefs' command.  Now performs
wenzelm@16234
  2029
automatic type-inference of declared constants; additional support for
wenzelm@16234
  2030
local structure declarations (cf. locales and HOL records), see also
wenzelm@16234
  2031
isar-ref manual.  Potential INCOMPATIBILITY: need to observe strictly
wenzelm@16234
  2032
sequential dependencies of definitions within a single 'constdefs'
wenzelm@16234
  2033
section; moreover, the declared name needs to be an identifier.  If
wenzelm@16234
  2034
all fails, consider to fall back on 'consts' and 'defs' separately.
wenzelm@16234
  2035
wenzelm@16234
  2036
* Improved indexed syntax and implicit structures.  First of all,
wenzelm@16234
  2037
indexed syntax provides a notational device for subscripted
wenzelm@16234
  2038
application, using the new syntax \<^bsub>term\<^esub> for arbitrary
wenzelm@16234
  2039
expressions.  Secondly, in a local context with structure
wenzelm@16234
  2040
declarations, number indexes \<^sub>n or the empty index (default
wenzelm@16234
  2041
number 1) refer to a certain fixed variable implicitly; option
wenzelm@16234
  2042
show_structs controls printing of implicit structures.  Typical
wenzelm@16234
  2043
applications of these concepts involve record types and locales.
wenzelm@16234
  2044
wenzelm@16234
  2045
* New command 'no_syntax' removes grammar declarations (and
wenzelm@16234
  2046
translations) resulting from the given syntax specification, which is
wenzelm@16234
  2047
interpreted in the same manner as for the 'syntax' command.
wenzelm@16234
  2048
wenzelm@16234
  2049
* 'Advanced' translation functions (parse_translation etc.) may depend
wenzelm@16234
  2050
on the signature of the theory context being presently used for
wenzelm@16234
  2051
parsing/printing, see also isar-ref manual.
wenzelm@16234
  2052
wenzelm@16856
  2053
* Improved 'oracle' command provides a type-safe interface to turn an
wenzelm@16856
  2054
ML expression of type theory -> T -> term into a primitive rule of
wenzelm@16856
  2055
type theory -> T -> thm (i.e. the functionality of Thm.invoke_oracle
wenzelm@16856
  2056
is already included here); see also FOL/ex/IffExample.thy;
wenzelm@16856
  2057
INCOMPATIBILITY.
wenzelm@16856
  2058
wenzelm@17275
  2059
* axclass: name space prefix for class "c" is now "c_class" (was "c"
wenzelm@17275
  2060
before); "cI" is no longer bound, use "c.intro" instead.
wenzelm@17275
  2061
INCOMPATIBILITY.  This change avoids clashes of fact bindings for
wenzelm@17275
  2062
axclasses vs. locales.
wenzelm@17275
  2063
wenzelm@16234
  2064
* Improved internal renaming of symbolic identifiers -- attach primes
wenzelm@16234
  2065
instead of base 26 numbers.
wenzelm@16234
  2066
wenzelm@16234
  2067
* New flag show_question_marks controls printing of leading question
wenzelm@16234
  2068
marks in schematic variable names.
wenzelm@16234
  2069
wenzelm@16234
  2070
* In schematic variable names, *any* symbol following \<^isub> or
wenzelm@16234
  2071
\<^isup> is now treated as part of the base name.  For example, the
wenzelm@16234
  2072
following works without printing of awkward ".0" indexes:
wenzelm@16234
  2073
wenzelm@16234
  2074
  lemma "x\<^isub>1 = x\<^isub>2 ==> x\<^isub>2 = x\<^isub>1"
wenzelm@16234
  2075
    by simp
wenzelm@16234
  2076
wenzelm@16234
  2077
* Inner syntax includes (*(*nested*) comments*).
wenzelm@16234
  2078
wenzelm@17548
  2079
* Pretty printer now supports unbreakable blocks, specified in mixfix
wenzelm@16234
  2080
annotations as "(00...)".
wenzelm@16234
  2081
wenzelm@16234
  2082
* Clear separation of logical types and nonterminals, where the latter
wenzelm@16234
  2083
may only occur in 'syntax' specifications or type abbreviations.
wenzelm@16234
  2084
Before that distinction was only partially implemented via type class
wenzelm@16234
  2085
"logic" vs. "{}".  Potential INCOMPATIBILITY in rare cases of improper
wenzelm@16234
  2086
use of 'types'/'consts' instead of 'nonterminals'/'syntax'.  Some very
wenzelm@16234
  2087
exotic syntax specifications may require further adaption
wenzelm@17691
  2088
(e.g. Cube/Cube.thy).
wenzelm@16234
  2089
wenzelm@16234
  2090
* Removed obsolete type class "logic", use the top sort {} instead.
wenzelm@16234
  2091
Note that non-logical types should be declared as 'nonterminals'
wenzelm@16234
  2092
rather than 'types'.  INCOMPATIBILITY for new object-logic
wenzelm@16234
  2093
specifications.
wenzelm@16234
  2094
ballarin@17095
  2095
* Attributes 'induct' and 'cases': type or set names may now be
ballarin@17095
  2096
locally fixed variables as well.
ballarin@17095
  2097
wenzelm@16234
  2098
* Simplifier: can now control the depth to which conditional rewriting
wenzelm@16234
  2099
is traced via the PG menu Isabelle -> Settings -> Trace Simp Depth
wenzelm@16234
  2100
Limit.
wenzelm@16234
  2101
wenzelm@16234
  2102
* Simplifier: simplification procedures may now take the current
wenzelm@16234
  2103
simpset into account (cf. Simplifier.simproc(_i) / mk_simproc
wenzelm@16234
  2104
interface), which is very useful for calling the Simplifier
wenzelm@16234
  2105
recursively.  Minor INCOMPATIBILITY: the 'prems' argument of simprocs
wenzelm@16234
  2106
is gone -- use prems_of_ss on the simpset instead.  Moreover, the
wenzelm@16234
  2107
low-level mk_simproc no longer applies Logic.varify internally, to
wenzelm@16234
  2108
allow for use in a context of fixed variables.
wenzelm@16234
  2109
wenzelm@16234
  2110
* thin_tac now works even if the assumption being deleted contains !!
wenzelm@16234
  2111
or ==>.  More generally, erule now works even if the major premise of
wenzelm@16234
  2112
the elimination rule contains !! or ==>.
wenzelm@16234
  2113
wenzelm@17597
  2114
* Method 'rules' has been renamed to 'iprover'. INCOMPATIBILITY.
nipkow@17590
  2115
wenzelm@16234
  2116
* Reorganized bootstrapping of the Pure theories; CPure is now derived
wenzelm@16234
  2117
from Pure, which contains all common declarations already.  Both
wenzelm@16234
  2118
theories are defined via plain Isabelle/Isar .thy files.
wenzelm@16234
  2119
INCOMPATIBILITY: elements of CPure (such as the CPure.intro /
wenzelm@16234
  2120
CPure.elim / CPure.dest attributes) now appear in the Pure name space;
wenzelm@16234
  2121
use isatool fixcpure to adapt your theory and ML sources.
wenzelm@16234
  2122
wenzelm@16234
  2123
* New syntax 'name(i-j, i-, i, ...)' for referring to specific
wenzelm@16234
  2124
selections of theorems in named facts via index ranges.
wenzelm@16234
  2125
wenzelm@17097
  2126
* 'print_theorems': in theory mode, really print the difference
wenzelm@17097
  2127
wrt. the last state (works for interactive theory development only),
wenzelm@17097
  2128
in proof mode print all local facts (cf. 'print_facts');
wenzelm@17097
  2129
wenzelm@17397
  2130
* 'hide': option '(open)' hides only base names.
wenzelm@17397
  2131
wenzelm@17275
  2132
* More efficient treatment of intermediate checkpoints in interactive
wenzelm@17275
  2133
theory development.
wenzelm@17275
  2134
berghofe@17663
  2135
* Code generator is now invoked via code_module (incremental code
wenzelm@17664
  2136
generation) and code_library (modular code generation, ML structures
wenzelm@17664
  2137
for each theory).  INCOMPATIBILITY: new keywords 'file' and 'contains'
wenzelm@17664
  2138
must be quoted when used as identifiers.
wenzelm@17664
  2139
wenzelm@17664
  2140
* New 'value' command for reading, evaluating and printing terms using
wenzelm@17664
  2141
the code generator.  INCOMPATIBILITY: command keyword 'value' must be
wenzelm@17664
  2142
quoted when used as identifier.
berghofe@17663
  2143
wenzelm@16234
  2144
wenzelm@16234
  2145
*** Locales ***
ballarin@17095
  2146
wenzelm@17385
  2147
* New commands for the interpretation of locale expressions in
wenzelm@17385
  2148
theories (1), locales (2) and proof contexts (3).  These generate
wenzelm@17385
  2149
proof obligations from the expression specification.  After the
wenzelm@17385
  2150
obligations have been discharged, theorems of the expression are added
wenzelm@17385
  2151
to the theory, target locale or proof context.  The synopsis of the
wenzelm@17385
  2152
commands is a follows:
wenzelm@17385
  2153
ballarin@17095
  2154
  (1) interpretation expr inst
ballarin@17095
  2155
  (2) interpretation target < expr
ballarin@17095
  2156
  (3) interpret expr inst
wenzelm@17385
  2157
ballarin@17095
  2158
Interpretation in theories and proof contexts require a parameter
ballarin@17095
  2159
instantiation of terms from the current context.  This is applied to
wenzelm@17385
  2160
specifications and theorems of the interpreted expression.
wenzelm@17385
  2161
Interpretation in locales only permits parameter renaming through the
wenzelm@17385
  2162
locale expression.  Interpretation is smart in that interpretations
wenzelm@17385
  2163
that are active already do not occur in proof obligations, neither are
wenzelm@17385
  2164
instantiated theorems stored in duplicate.  Use 'print_interps' to
wenzelm@17385
  2165
inspect active interpretations of a particular locale.  For details,
ballarin@17436
  2166
see the Isar Reference manual.  Examples can be found in
ballarin@17436
  2167
HOL/Finite_Set.thy and HOL/Algebra/UnivPoly.thy.
wenzelm@16234
  2168
wenzelm@16234
  2169
INCOMPATIBILITY: former 'instantiate' has been withdrawn, use
wenzelm@16234
  2170
'interpret' instead.
wenzelm@16234
  2171
wenzelm@17385
  2172
* New context element 'constrains' for adding type constraints to
wenzelm@17385
  2173
parameters.
wenzelm@17385
  2174
wenzelm@17385
  2175
* Context expressions: renaming of parameters with syntax
wenzelm@17385
  2176
redeclaration.
ballarin@17095
  2177
ballarin@17095
  2178
* Locale declaration: 'includes' disallowed.
ballarin@17095
  2179
wenzelm@16234
  2180
* Proper static binding of attribute syntax -- i.e. types / terms /
wenzelm@16234
  2181
facts mentioned as arguments are always those of the locale definition
wenzelm@16234
  2182
context, independently of the context of later invocations.  Moreover,
wenzelm@16234
  2183
locale operations (renaming and type / term instantiation) are applied
wenzelm@16234
  2184
to attribute arguments as expected.
wenzelm@16234
  2185
wenzelm@16234
  2186
INCOMPATIBILITY of the ML interface: always pass Attrib.src instead of
wenzelm@16234
  2187
actual attributes; rare situations may require Attrib.attribute to
wenzelm@16234
  2188
embed those attributes into Attrib.src that lack concrete syntax.
wenzelm@16234
  2189
Attribute implementations need to cooperate properly with the static
wenzelm@16234
  2190
binding mechanism.  Basic parsers Args.XXX_typ/term/prop and
wenzelm@16234
  2191
Attrib.XXX_thm etc. already do the right thing without further
wenzelm@16234
  2192
intervention.  Only unusual applications -- such as "where" or "of"
wenzelm@16234
  2193
(cf. src/Pure/Isar/attrib.ML), which process arguments depending both
wenzelm@16234
  2194
on the context and the facts involved -- may have to assign parsed
wenzelm@16234
  2195
values to argument tokens explicitly.
wenzelm@16234
  2196
wenzelm@16234
  2197
* Changed parameter management in theorem generation for long goal
wenzelm@16234
  2198
statements with 'includes'.  INCOMPATIBILITY: produces a different
wenzelm@16234
  2199
theorem statement in rare situations.
wenzelm@16234
  2200
ballarin@17228
  2201
* Locale inspection command 'print_locale' omits notes elements.  Use
ballarin@17228
  2202
'print_locale!' to have them included in the output.
ballarin@17228
  2203
wenzelm@16234
  2204
wenzelm@16234
  2205
*** Provers ***
wenzelm@16234
  2206
wenzelm@16234
  2207
* Provers/hypsubst.ML: improved version of the subst method, for
wenzelm@16234
  2208
single-step rewriting: it now works in bound variable contexts. New is
wenzelm@16234
  2209
'subst (asm)', for rewriting an assumption.  INCOMPATIBILITY: may
wenzelm@16234
  2210
rewrite a different subterm than the original subst method, which is
wenzelm@16234
  2211
still available as 'simplesubst'.
wenzelm@16234
  2212
wenzelm@16234
  2213
* Provers/quasi.ML: new transitivity reasoners for transitivity only
wenzelm@16234
  2214
and quasi orders.
wenzelm@16234
  2215
wenzelm@16234
  2216
* Provers/trancl.ML: new transitivity reasoner for transitive and
wenzelm@16234
  2217
reflexive-transitive closure of relations.
wenzelm@16234
  2218
wenzelm@16234
  2219
* Provers/blast.ML: new reference depth_limit to make blast's depth
wenzelm@16234
  2220
limit (previously hard-coded with a value of 20) user-definable.
wenzelm@16234
  2221
wenzelm@16234
  2222
* Provers/simplifier.ML has been moved to Pure, where Simplifier.setup
wenzelm@16234
  2223
is peformed already.  Object-logics merely need to finish their
wenzelm@16234
  2224
initial simpset configuration as before.  INCOMPATIBILITY.
wenzelm@15703
  2225
berghofe@15475
  2226
schirmer@14700
  2227
*** HOL ***
schirmer@14700
  2228
wenzelm@16234
  2229
* Symbolic syntax of Hilbert Choice Operator is now as follows:
wenzelm@14878
  2230
wenzelm@14878
  2231
  syntax (epsilon)
wenzelm@14878
  2232
    "_Eps" :: "[pttrn, bool] => 'a"    ("(3\<some>_./ _)" [0, 10] 10)
wenzelm@14878
  2233
wenzelm@16234
  2234
The symbol \<some> is displayed as the alternative epsilon of LaTeX
wenzelm@16234
  2235
and x-symbol; use option '-m epsilon' to get it actually printed.
wenzelm@16234
  2236
Moreover, the mathematically important symbolic identifier \<epsilon>
wenzelm@16234
  2237
becomes available as variable, constant etc.  INCOMPATIBILITY,
wenzelm@16234
  2238
wenzelm@16234
  2239
* "x > y" abbreviates "y < x" and "x >= y" abbreviates "y <= x".
wenzelm@16234
  2240
Similarly for all quantifiers: "ALL x > y" etc.  The x-symbol for >=
wenzelm@17371
  2241
is \<ge>. New transitivity rules have been added to HOL/Orderings.thy to
avigad@17016
  2242
support corresponding Isar calculations.
wenzelm@16234
  2243
wenzelm@16234
  2244
* "{x:A. P}" abbreviates "{x. x:A & P}", and similarly for "\<in>"
wenzelm@16234
  2245
instead of ":".
wenzelm@16234
  2246
wenzelm@16234
  2247
* theory SetInterval: changed the syntax for open intervals:
wenzelm@16234
  2248
wenzelm@16234
  2249
  Old       New
wenzelm@16234
  2250
  {..n(}    {..<n}
wenzelm@16234
  2251
  {)n..}    {n<..}
wenzelm@16234
  2252
  {m..n(}   {m..<n}
wenzelm@16234
  2253
  {)m..n}   {m<..n}
wenzelm@16234
  2254
  {)m..n(}  {m<..<n}
wenzelm@16234
  2255
wenzelm@16234
  2256
The old syntax is still supported but will disappear in the next
wenzelm@16234
  2257
release.  For conversion use the following Emacs search and replace
wenzelm@16234
  2258
patterns (these are not perfect but work quite well):
nipkow@15046
  2259
nipkow@15046
  2260
  {)\([^\.]*\)\.\.  ->  {\1<\.\.}
nipkow@15046
  2261
  \.\.\([^(}]*\)(}  ->  \.\.<\1}
nipkow@15046
  2262
wenzelm@17533
  2263
* Theory Commutative_Ring (in Library): method comm_ring for proving
wenzelm@17533
  2264
equalities in commutative rings; method 'algebra' provides a generic
wenzelm@17533
  2265
interface.
wenzelm@17389
  2266
wenzelm@17389
  2267
* Theory Finite_Set: changed the syntax for 'setsum', summation over
wenzelm@16234
  2268
finite sets: "setsum (%x. e) A", which used to be "\<Sum>x:A. e", is
wenzelm@17371
  2269
now either "SUM x:A. e" or "\<Sum>x \<in> A. e". The bound variable can
paulson@17189
  2270
be a tuple pattern.
wenzelm@16234
  2271
wenzelm@16234
  2272
Some new syntax forms are available:
wenzelm@16234
  2273
wenzelm@16234
  2274
  "\<Sum>x | P. e"      for     "setsum (%x. e) {x. P}"
wenzelm@16234
  2275
  "\<Sum>x = a..b. e"   for     "setsum (%x. e) {a..b}"
wenzelm@16234
  2276
  "\<Sum>x = a..<b. e"  for     "setsum (%x. e) {a..<b}"
wenzelm@16234
  2277
  "\<Sum>x < k. e"      for     "setsum (%x. e) {..<k}"
wenzelm@16234
  2278
wenzelm@16234
  2279
The latter form "\<Sum>x < k. e" used to be based on a separate
wenzelm@16234
  2280
function "Summation", which has been discontinued.
wenzelm@16234
  2281
wenzelm@16234
  2282
* theory Finite_Set: in structured induction proofs, the insert case
wenzelm@16234
  2283
is now 'case (insert x F)' instead of the old counterintuitive 'case
wenzelm@16234
  2284
(insert F x)'.
wenzelm@16234
  2285
wenzelm@16234
  2286
* The 'refute' command has been extended to support a much larger
wenzelm@16234
  2287
fragment of HOL, including axiomatic type classes, constdefs and
wenzelm@16234
  2288
typedefs, inductive datatypes and recursion.
wenzelm@16234
  2289
webertj@17700
  2290
* New tactics 'sat' and 'satx' to prove propositional tautologies.
webertj@17700
  2291
Requires zChaff with proof generation to be installed.  See
webertj@17700
  2292
HOL/ex/SAT_Examples.thy for examples.
webertj@17619
  2293
wenzelm@16234
  2294
* Datatype induction via method 'induct' now preserves the name of the
wenzelm@16234
  2295
induction variable. For example, when proving P(xs::'a list) by
wenzelm@16234
  2296
induction on xs, the induction step is now P(xs) ==> P(a#xs) rather
wenzelm@16234
  2297
than P(list) ==> P(a#list) as previously.  Potential INCOMPATIBILITY
wenzelm@16234
  2298
in unstructured proof scripts.
wenzelm@16234
  2299
wenzelm@16234
  2300
* Reworked implementation of records.  Improved scalability for
wenzelm@16234
  2301
records with many fields, avoiding performance problems for type
wenzelm@16234
  2302
inference. Records are no longer composed of nested field types, but
wenzelm@16234
  2303
of nested extension types. Therefore the record type only grows linear
wenzelm@16234
  2304
in the number of extensions and not in the number of fields.  The
wenzelm@16234
  2305
top-level (users) view on records is preserved.  Potential
wenzelm@16234
  2306
INCOMPATIBILITY only in strange cases, where the theory depends on the
wenzelm@16234
  2307
old record representation. The type generated for a record is called
wenzelm@16234
  2308
<record_name>_ext_type.
wenzelm@16234
  2309
wenzelm@16234
  2310
Flag record_quick_and_dirty_sensitive can be enabled to skip the
wenzelm@16234
  2311
proofs triggered by a record definition or a simproc (if
wenzelm@16234
  2312
quick_and_dirty is enabled).  Definitions of large records can take
wenzelm@16234
  2313
quite long.
wenzelm@16234
  2314
wenzelm@16234
  2315
New simproc record_upd_simproc for simplification of multiple record
wenzelm@16234
  2316
updates enabled by default.  Moreover, trivial updates are also
wenzelm@16234
  2317
removed: r(|x := x r|) = r.  INCOMPATIBILITY: old proofs break
wenzelm@16234
  2318
occasionally, since simplification is more powerful by default.
wenzelm@16234
  2319
wenzelm@17275
  2320
* typedef: proper support for polymorphic sets, which contain extra
wenzelm@17275
  2321
type-variables in the term.
wenzelm@17275
  2322
wenzelm@16234
  2323
* Simplifier: automatically reasons about transitivity chains
wenzelm@16234
  2324
involving "trancl" (r^+) and "rtrancl" (r^*) by setting up tactics
wenzelm@16234
  2325
provided by Provers/trancl.ML as additional solvers.  INCOMPATIBILITY:
wenzelm@16234
  2326
old proofs break occasionally as simplification may now solve more
wenzelm@16234
  2327
goals than previously.
wenzelm@16234
  2328
wenzelm@16234
  2329
* Simplifier: converts x <= y into x = y if assumption y <= x is
wenzelm@16234
  2330
present.  Works for all partial orders (class "order"), in particular
wenzelm@16234
  2331
numbers and sets.  For linear orders (e.g. numbers) it treats ~ x < y
wenzelm@16234
  2332
just like y <= x.
wenzelm@16234
  2333
wenzelm@16234
  2334
* Simplifier: new simproc for "let x = a in f x".  If a is a free or
wenzelm@16234
  2335
bound variable or a constant then the let is unfolded.  Otherwise
wenzelm@16234
  2336
first a is simplified to b, and then f b is simplified to g. If
wenzelm@16234
  2337
possible we abstract b from g arriving at "let x = b in h x",
wenzelm@16234
  2338
otherwise we unfold the let and arrive at g.  The simproc can be
wenzelm@16234
  2339
enabled/disabled by the reference use_let_simproc.  Potential
wenzelm@16234
  2340
INCOMPATIBILITY since simplification is more powerful by default.
webertj@15776
  2341
paulson@16563
  2342
* Classical reasoning: the meson method now accepts theorems as arguments.
paulson@16563
  2343
paulson@17595
  2344
* Prover support: pre-release of the Isabelle-ATP linkup, which runs background
paulson@17595
  2345
jobs to provide advice on the provability of subgoals.
paulson@17595
  2346
wenzelm@16891
  2347
* Theory OrderedGroup and Ring_and_Field: various additions and
wenzelm@16891
  2348
improvements to faciliate calculations involving equalities and
wenzelm@16891
  2349
inequalities.
wenzelm@16891
  2350
wenzelm@16891
  2351
The following theorems have been eliminated or modified
wenzelm@16891
  2352
(INCOMPATIBILITY):
avigad@16888
  2353
avigad@16888
  2354
  abs_eq             now named abs_of_nonneg
wenzelm@17371
  2355
  abs_of_ge_0        now named abs_of_nonneg
wenzelm@17371
  2356
  abs_minus_eq       now named abs_of_nonpos
avigad@16888
  2357
  imp_abs_id         now named abs_of_nonneg
avigad@16888
  2358
  imp_abs_neg_id     now named abs_of_nonpos
avigad@16888
  2359
  mult_pos           now named mult_pos_pos
avigad@16888
  2360
  mult_pos_le        now named mult_nonneg_nonneg
avigad@16888
  2361
  mult_pos_neg_le    now named mult_nonneg_nonpos
avigad@16888
  2362
  mult_pos_neg2_le   now named mult_nonneg_nonpos2
avigad@16888
  2363
  mult_neg           now named mult_neg_neg
avigad@16888
  2364
  mult_neg_le        now named mult_nonpos_nonpos
avigad@16888
  2365
obua@23495
  2366
* The following lemmas in Ring_and_Field have been added to the simplifier:
obua@23495
  2367
     
obua@23495
  2368
     zero_le_square
obua@23495
  2369
     not_square_less_zero 
obua@23495
  2370
obua@23495
  2371
  The following lemmas have been deleted from Real/RealPow:
obua@23495
  2372
  
obua@23495
  2373
     realpow_zero_zero
obua@23495
  2374
     realpow_two
obua@23495
  2375
     realpow_less
obua@23495
  2376
     zero_le_power
obua@23495
  2377
     realpow_two_le
obua@23495
  2378
     abs_realpow_two
obua@23495
  2379
     realpow_two_abs     
obua@23495
  2380
wenzelm@16891
  2381
* Theory Parity: added rules for simplifying exponents.
wenzelm@16891
  2382
nipkow@17092
  2383
* Theory List:
nipkow@17092
  2384
nipkow@17092
  2385
The following theorems have been eliminated or modified
nipkow@17092
  2386
(INCOMPATIBILITY):
nipkow@17092
  2387
nipkow@17092
  2388
  list_all_Nil       now named list_all.simps(1)
nipkow@17092
  2389
  list_all_Cons      now named list_all.simps(2)
nipkow@17092
  2390
  list_all_conv      now named list_all_iff
nipkow@17092
  2391
  set_mem_eq         now named mem_iff
nipkow@17092
  2392
wenzelm@16929
  2393
* Theories SetsAndFunctions and BigO (see HOL/Library) support
wenzelm@16929
  2394
asymptotic "big O" calculations.  See the notes in BigO.thy.
wenzelm@16929
  2395
avigad@16888
  2396
avigad@16888
  2397
*** HOL-Complex ***
avigad@16888
  2398
wenzelm@16891
  2399
* Theory RealDef: better support for embedding natural numbers and
wenzelm@16891
  2400
integers in the reals.
wenzelm@16891
  2401
wenzelm@16891
  2402
The following theorems have been eliminated or modified
wenzelm@16891
  2403
(INCOMPATIBILITY):
wenzelm@16891
  2404
avigad@17016
  2405
  exp_ge_add_one_self  now requires no hypotheses
avigad@17016
  2406
  real_of_int_add      reversed direction of equality (use [symmetric])
avigad@17016
  2407
  real_of_int_minus    reversed direction of equality (use [symmetric])
avigad@17016
  2408
  real_of_int_diff     reversed direction of equality (use [symmetric])
avigad@17016
  2409
  real_of_int_mult     reversed direction of equality (use [symmetric])
wenzelm@16891
  2410
wenzelm@16891
  2411
* Theory RComplete: expanded support for floor and ceiling functions.
avigad@16888
  2412
avigad@16962
  2413
* Theory Ln is new, with properties of the natural logarithm
avigad@16962
  2414
wenzelm@17423
  2415
* Hyperreal: There is a new type constructor "star" for making
wenzelm@17423
  2416
nonstandard types.  The old type names are now type synonyms:
wenzelm@17423
  2417
wenzelm@17423
  2418
  hypreal = real star
wenzelm@17423
  2419
  hypnat = nat star
wenzelm@17423
  2420
  hcomplex = complex star
wenzelm@17423
  2421
wenzelm@17423
  2422
* Hyperreal: Many groups of similarly-defined constants have been
huffman@17442
  2423
replaced by polymorphic versions (INCOMPATIBILITY):
wenzelm@17423
  2424
wenzelm@17423
  2425
  star_of <-- hypreal_of_real, hypnat_of_nat, hcomplex_of_complex
wenzelm@17423
  2426
wenzelm@17423
  2427
  starset      <-- starsetNat, starsetC
wenzelm@17423
  2428
  *s*          <-- *sNat*, *sc*
wenzelm@17423
  2429
  starset_n    <-- starsetNat_n, starsetC_n
wenzelm@17423
  2430
  *sn*         <-- *sNatn*, *scn*
wenzelm@17423
  2431
  InternalSets <-- InternalNatSets, InternalCSets
wenzelm@17423
  2432
huffman@17442
  2433
  starfun      <-- starfun{Nat,Nat2,C,RC,CR}
wenzelm@17423
  2434
  *f*          <-- *fNat*, *fNat2*, *fc*, *fRc*, *fcR*
huffman@17442
  2435
  starfun_n    <-- starfun{Nat,Nat2,C,RC,CR}_n
wenzelm@17423
  2436
  *fn*         <-- *fNatn*, *fNat2n*, *fcn*, *fRcn*, *fcRn*
huffman@17442
  2437
  InternalFuns <-- InternalNatFuns, InternalNatFuns2, Internal{C,RC,CR}Funs
wenzelm@17423
  2438
wenzelm@17423
  2439
* Hyperreal: Many type-specific theorems have been removed in favor of
huffman@17442
  2440
theorems specific to various axiomatic type classes (INCOMPATIBILITY):
huffman@17442
  2441
huffman@17442
  2442
  add_commute <-- {hypreal,hypnat,hcomplex}_add_commute
huffman@17442
  2443
  add_assoc   <-- {hypreal,hypnat,hcomplex}_add_assocs
huffman@17442
  2444
  OrderedGroup.add_0 <-- {hypreal,hypnat,hcomplex}_add_zero_left
huffman@17442
  2445
  OrderedGroup.add_0_right <-- {hypreal,hcomplex}_add_zero_right
wenzelm@17423
  2446
  right_minus <-- hypreal_add_minus
huffman@17442
  2447
  left_minus <-- {hypreal,hcomplex}_add_minus_left
huffman@17442
  2448
  mult_commute <-- {hypreal,hypnat,hcomplex}_mult_commute
huffman@17442
  2449
  mult_assoc <-- {hypreal,hypnat,hcomplex}_mult_assoc
huffman@17442
  2450
  mult_1_left <-- {hypreal,hypnat}_mult_1, hcomplex_mult_one_left
wenzelm@17423
  2451
  mult_1_right <-- hcomplex_mult_one_right
wenzelm@17423
  2452
  mult_zero_left <-- hcomplex_mult_zero_left
huffman@17442
  2453
  left_distrib <-- {hypreal,hypnat,hcomplex}_add_mult_distrib
wenzelm@17423
  2454
  right_distrib <-- hypnat_add_mult_distrib2
huffman@17442
  2455
  zero_neq_one <-- {hypreal,hypnat,hcomplex}_zero_not_eq_one
wenzelm@17423
  2456
  right_inverse <-- hypreal_mult_inverse
wenzelm@17423
  2457
  left_inverse <-- hypreal_mult_inverse_left, hcomplex_mult_inv_left
huffman@17442
  2458
  order_refl <-- {hypreal,hypnat}_le_refl
huffman@17442
  2459
  order_trans <-- {hypreal,hypnat}_le_trans
huffman@17442
  2460
  order_antisym <-- {hypreal,hypnat}_le_anti_sym
huffman@17442
  2461
  order_less_le <-- {hypreal,hypnat}_less_le
huffman@17442
  2462
  linorder_linear <-- {hypreal,hypnat}_le_linear
huffman@17442
  2463
  add_left_mono <-- {hypreal,hypnat}_add_left_mono
huffman@17442
  2464
  mult_strict_left_mono <-- {hypreal,hypnat}_mult_less_mono2
wenzelm@17423
  2465
  add_nonneg_nonneg <-- hypreal_le_add_order
wenzelm@17423
  2466
wenzelm@17423
  2467
* Hyperreal: Separate theorems having to do with type-specific
wenzelm@17423
  2468
versions of constants have been merged into theorems that apply to the
huffman@17442
  2469
new polymorphic constants (INCOMPATIBILITY):
huffman@17442
  2470
huffman@17442
  2471
  STAR_UNIV_set <-- {STAR_real,NatStar_real,STARC_complex}_set
huffman@17442
  2472
  STAR_empty_set <-- {STAR,NatStar,STARC}_empty_set
huffman@17442
  2473
  STAR_Un <-- {STAR,NatStar,STARC}_Un
huffman@17442
  2474
  STAR_Int <-- {STAR,NatStar,STARC}_Int
huffman@17442
  2475
  STAR_Compl <-- {STAR,NatStar,STARC}_Compl
huffman@17442
  2476
  STAR_subset <-- {STAR,NatStar,STARC}_subset
huffman@17442
  2477
  STAR_mem <-- {STAR,NatStar,STARC}_mem
huffman@17442
  2478
  STAR_mem_Compl <-- {STAR,STARC}_mem_Compl
huffman@17442
  2479
  STAR_diff <-- {STAR,STARC}_diff
huffman@17442
  2480
  STAR_star_of_image_subset <-- {STAR_hypreal_of_real, NatStar_hypreal_of_real,
huffman@17442
  2481
    STARC_hcomplex_of_complex}_image_subset
huffman@17442
  2482
  starset_n_Un <-- starset{Nat,C}_n_Un
huffman@17442
  2483
  starset_n_Int <-- starset{Nat,C}_n_Int
huffman@17442
  2484
  starset_n_Compl <-- starset{Nat,C}_n_Compl
huffman@17442
  2485
  starset_n_diff <-- starset{Nat,C}_n_diff
huffman@17442
  2486
  InternalSets_Un <-- Internal{Nat,C}Sets_Un
huffman@17442
  2487
  InternalSets_Int <-- Internal{Nat,C}Sets_Int
huffman@17442
  2488
  InternalSets_Compl <-- Internal{Nat,C}Sets_Compl
huffman@17442
  2489
  InternalSets_diff <-- Internal{Nat,C}Sets_diff
huffman@17442
  2490
  InternalSets_UNIV_diff <-- Internal{Nat,C}Sets_UNIV_diff
huffman@17442
  2491
  InternalSets_starset_n <-- Internal{Nat,C}Sets_starset{Nat,C}_n
huffman@17442
  2492
  starset_starset_n_eq <-- starset{Nat,C}_starset{Nat,C}_n_eq
huffman@17442
  2493
  starset_n_starset <-- starset{Nat,C}_n_starset{Nat,C}
huffman@17442
  2494
  starfun_n_starfun <-- starfun{Nat,Nat2,C,RC,CR}_n_starfun{Nat,Nat2,C,RC,CR}
huffman@17442
  2495
  starfun <-- starfun{Nat,Nat2,C,RC,CR}
huffman@17442
  2496
  starfun_mult <-- starfun{Nat,Nat2,C,RC,CR}_mult
huffman@17442
  2497
  starfun_add <-- starfun{Nat,Nat2,C,RC,CR}_add
huffman@17442
  2498
  starfun_minus <-- starfun{Nat,Nat2,C,RC,CR}_minus
huffman@17442
  2499
  starfun_diff <-- starfun{C,RC,CR}_diff
huffman@17442
  2500
  starfun_o <-- starfun{NatNat2,Nat2,_stafunNat,C,C_starfunRC,_starfunCR}_o
huffman@17442
  2501
  starfun_o2 <-- starfun{NatNat2,_stafunNat,C,C_starfunRC,_starfunCR}_o2
huffman@17442
  2502
  starfun_const_fun <-- starfun{Nat,Nat2,C,RC,CR}_const_fun
huffman@17442
  2503
  starfun_inverse <-- starfun{Nat,C,RC,CR}_inverse
huffman@17442
  2504
  starfun_eq <-- starfun{Nat,Nat2,C,RC,CR}_eq
huffman@17442
  2505
  starfun_eq_iff <-- starfun{C,RC,CR}_eq_iff
wenzelm@17423
  2506
  starfun_Id <-- starfunC_Id
huffman@17442
  2507
  starfun_approx <-- starfun{Nat,CR}_approx
huffman@17442
  2508
  starfun_capprox <-- starfun{C,RC}_capprox
wenzelm@17423
  2509
  starfun_abs <-- starfunNat_rabs
huffman@17442
  2510
  starfun_lambda_cancel <-- starfun{C,CR,RC}_lambda_cancel
huffman@17442
  2511
  starfun_lambda_cancel2 <-- starfun{C,CR,RC}_lambda_cancel2
wenzelm@17423
  2512
  starfun_mult_HFinite_approx <-- starfunCR_mult_HFinite_capprox
huffman@17442
  2513
  starfun_mult_CFinite_capprox <-- starfun{C,RC}_mult_CFinite_capprox
huffman@17442
  2514
  starfun_add_capprox <-- starfun{C,RC}_add_capprox
wenzelm@17423
  2515
  starfun_add_approx <-- starfunCR_add_approx
wenzelm@17423
  2516
  starfun_inverse_inverse <-- starfunC_inverse_inverse
huffman@17442
  2517
  starfun_divide <-- starfun{C,CR,RC}_divide
huffman@17442
  2518
  starfun_n <-- starfun{Nat,C}_n
huffman@17442
  2519
  starfun_n_mult <-- starfun{Nat,C}_n_mult
huffman@17442
  2520
  starfun_n_add <-- starfun{Nat,C}_n_add
wenzelm@17423
  2521
  starfun_n_add_minus <-- starfunNat_n_add_minus
huffman@17442
  2522
  starfun_n_const_fun <-- starfun{Nat,C}_n_const_fun
huffman@17442
  2523
  starfun_n_minus <-- starfun{Nat,C}_n_minus
huffman@17442
  2524
  starfun_n_eq <-- starfun{Nat,C}_n_eq
huffman@17442
  2525
huffman@17442
  2526
  star_n_add <-- {hypreal,hypnat,hcomplex}_add
huffman@17442
  2527
  star_n_minus <-- {hypreal,hcomplex}_minus
huffman@17442
  2528
  star_n_diff <-- {hypreal,hcomplex}_diff
huffman@17442
  2529
  star_n_mult <-- {hypreal,hcomplex}_mult
huffman@17442
  2530
  star_n_inverse <-- {hypreal,hcomplex}_inverse
huffman@17442
  2531
  star_n_le <-- {hypreal,hypnat}_le
huffman@17442
  2532
  star_n_less <-- {hypreal,hypnat}_less
huffman@17442
  2533
  star_n_zero_num <-- {hypreal,hypnat,hcomplex}_zero_num
huffman@17442
  2534
  star_n_one_num <-- {hypreal,hypnat,hcomplex}_one_num
wenzelm@17423
  2535
  star_n_abs <-- hypreal_hrabs
wenzelm@17423
  2536
  star_n_divide <-- hcomplex_divide
wenzelm@17423
  2537
huffman@17442
  2538
  star_of_add <-- {hypreal_of_real,hypnat_of_nat,hcomplex_of_complex}_add
huffman@17442
  2539
  star_of_minus <-- {hypreal_of_real,hcomplex_of_complex}_minus
wenzelm@17423
  2540
  star_of_diff <-- hypreal_of_real_diff
huffman@17442
  2541
  star_of_mult <-- {hypreal_of_real,hypnat_of_nat,hcomplex_of_complex}_mult
huffman@17442
  2542
  star_of_one <-- {hypreal_of_real,hcomplex_of_complex}_one
huffman@17442
  2543
  star_of_zero <-- {hypreal_of_real,hypnat_of_nat,hcomplex_of_complex}_zero
huffman@17442
  2544
  star_of_le <-- {hypreal_of_real,hypnat_of_nat}_le_iff
huffman@17442
  2545
  star_of_less <-- {hypreal_of_real,hypnat_of_nat}_less_iff
huffman@17442
  2546
  star_of_eq <-- {hypreal_of_real,hypnat_of_nat,hcomplex_of_complex}_eq_iff
huffman@17442
  2547
  star_of_inverse <-- {hypreal_of_real,hcomplex_of_complex}_inverse
huffman@17442
  2548
  star_of_divide <-- {hypreal_of_real,hcomplex_of_complex}_divide
huffman@17442
  2549
  star_of_of_nat <-- {hypreal_of_real,hcomplex_of_complex}_of_nat
huffman@17442
  2550
  star_of_of_int <-- {hypreal_of_real,hcomplex_of_complex}_of_int
huffman@17442
  2551
  star_of_number_of <-- {hypreal,hcomplex}_number_of
wenzelm@17423
  2552
  star_of_number_less <-- number_of_less_hypreal_of_real_iff
wenzelm@17423
  2553
  star_of_number_le <-- number_of_le_hypreal_of_real_iff
wenzelm@17423
  2554
  star_of_eq_number <-- hypreal_of_real_eq_number_of_iff
wenzelm@17423
  2555
  star_of_less_number <-- hypreal_of_real_less_number_of_iff
wenzelm@17423
  2556
  star_of_le_number <-- hypreal_of_real_le_number_of_iff
wenzelm@17423
  2557
  star_of_power <-- hypreal_of_real_power
wenzelm@17423
  2558
  star_of_eq_0 <-- hcomplex_of_complex_zero_iff
wenzelm@17423
  2559
huffman@17442
  2560
* Hyperreal: new method "transfer" that implements the transfer
huffman@17442
  2561
principle of nonstandard analysis. With a subgoal that mentions
huffman@17442
  2562
nonstandard types like "'a star", the command "apply transfer"
huffman@17442
  2563
replaces it with an equivalent one that mentions only standard types.
huffman@17442
  2564
To be successful, all free variables must have standard types; non-
huffman@17442
  2565
standard variables must have explicit universal quantifiers.
huffman@17442
  2566
wenzelm@17641
  2567
* Hyperreal: A theory of Taylor series.
wenzelm@17641
  2568
wenzelm@14655
  2569
wenzelm@14682
  2570
*** HOLCF ***
wenzelm@14682
  2571
wenzelm@17533
  2572
* Discontinued special version of 'constdefs' (which used to support
wenzelm@17533
  2573
continuous functions) in favor of the general Pure one with full
wenzelm@17533
  2574
type-inference.
wenzelm@17533
  2575
wenzelm@17533
  2576
* New simplification procedure for solving continuity conditions; it
wenzelm@17533
  2577
is much faster on terms with many nested lambda abstractions (cubic
huffman@17442
  2578
instead of exponential time).
huffman@17442
  2579
wenzelm@17533
  2580
* New syntax for domain package: selector names are now optional.
huffman@17442
  2581
Parentheses should be omitted unless argument is lazy, for example:
huffman@17442
  2582
huffman@17442
  2583
  domain 'a stream = cons "'a" (lazy "'a stream")
huffman@17442
  2584
wenzelm@17533
  2585
* New command 'fixrec' for defining recursive functions with pattern
wenzelm@17533
  2586
matching; defining multiple functions with mutual recursion is also
wenzelm@17533
  2587
supported.  Patterns may include the constants cpair, spair, up, sinl,
wenzelm@17533
  2588
sinr, or any data constructor defined by the domain package. The given
wenzelm@17533
  2589
equations are proven as rewrite rules. See HOLCF/ex/Fixrec_ex.thy for
wenzelm@17533
  2590
syntax and examples.
wenzelm@17533
  2591
wenzelm@17533
  2592
* New commands 'cpodef' and 'pcpodef' for defining predicate subtypes
wenzelm@17533
  2593
of cpo and pcpo types. Syntax is exactly like the 'typedef' command,
wenzelm@17533
  2594
but the proof obligation additionally includes an admissibility
wenzelm@17533
  2595
requirement. The packages generate instances of class cpo or pcpo,
wenzelm@17533
  2596
with continuity and strictness theorems for Rep and Abs.
huffman@17442
  2597
huffman@17584
  2598
* HOLCF: Many theorems have been renamed according to a more standard naming
huffman@17584
  2599
scheme (INCOMPATIBILITY):
huffman@17584
  2600
huffman@17584
  2601
  foo_inject:  "foo$x = foo$y ==> x = y"
huffman@17584
  2602
  foo_eq:      "(foo$x = foo$y) = (x = y)"
huffman@17584
  2603
  foo_less:    "(foo$x << foo$y) = (x << y)"
huffman@17584
  2604
  foo_strict:  "foo$UU = UU"
huffman@17584
  2605
  foo_defined: "... ==> foo$x ~= UU"
huffman@17584
  2606
  foo_defined_iff: "(foo$x = UU) = (x = UU)"
huffman@17584
  2607
wenzelm@14682
  2608
paulson@14885
  2609
*** ZF ***
paulson@14885
  2610
wenzelm@16234
  2611
* ZF/ex: theories Group and Ring provide examples in abstract algebra,
wenzelm@16234
  2612
including the First Isomorphism Theorem (on quotienting by the kernel
wenzelm@16234
  2613
of a homomorphism).
wenzelm@15089
  2614
wenzelm@15089
  2615
* ZF/Simplifier: install second copy of type solver that actually
wenzelm@16234
  2616
makes use of TC rules declared to Isar proof contexts (or locales);
wenzelm@16234
  2617
the old version is still required for ML proof scripts.
wenzelm@15703
  2618
wenzelm@15703
  2619
wenzelm@17445
  2620
*** Cube ***
wenzelm@17445
  2621