NEWS
author wenzelm
Thu Apr 17 22:28:56 2008 +0200 (2008-04-17)
changeset 26718 0c652e82fdf4
parent 26681 19e1d3c96f2f
child 26724 ff6ff3a9010e
permissions -rw-r--r--
* Context-dependent token translations.
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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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*** General ***
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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 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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* 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 directly.
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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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*** 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 fun(ction) are considered to
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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 ProofGeneral 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.  Potential INCOMPATIBILITY.
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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.
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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 HOL/Complex/Complex.thy for an Isar example and
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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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*** HOL ***
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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 enum from
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theory Library/Enum instead to achieve a similar effect.  INCOMPATIBILITY.
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* Theory List: rule list_induct2 now has explicitly named cases "Nil" and "Cons".
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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 injective_fst_snd
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removed, use split_eta and prod_eqI instead.  Renamed upd_fst to apfst and upd_snd
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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: New theory of red-black trees, an efficient
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implementation of 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 favour 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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* Theorems "power.simps" renamed to "power_int.simps".
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* Class semiring_div provides basic abstract properties of semirings
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with division and modulo operations.  Subsumes former class dvd_mod.
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* Merged theories IntDef, Numeral and IntArith into unified theory
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Int.  INCOMPATIBILITY.
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* Theory Library/Code_Index: type "index" now represents natural
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numbers rather than integers.  INCOMPATIBILITY.
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* New class "uminus" with operation "uminus" (split of from class
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"minus" which now only has operation "minus", binary).
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INCOMPATIBILITY.
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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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* Library/Multiset: {#a, b, c#} abbreviates {#a#} + {#b#} + {#c#}.
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* Library/ListVector: new theory of arithmetic vector operations.
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* Library/Order_Relation: new theory of various orderings as sets of pairs.
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  Defines preorders, partial orders, linear orders and well-orders
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  on sets and on types.
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* Constants "card", "internal_split", "option_map" now with authentic
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syntax.  INCOMPATIBILITY.
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* Definitions subset_def, psubset_def, set_diff_def, Compl_def,
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le_bool_def, less_bool_def, le_fun_def, less_fun_def, inf_bool_def,
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sup_bool_def, Inf_bool_def, Sup_bool_def, inf_fun_def, sup_fun_def,
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Inf_fun_def, Sup_fun_def, inf_set_def, sup_set_def, Inf_set_def,
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Sup_set_def, le_def, less_def, option_map_def now with object
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equality.  INCOMPATIBILITY.
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* Method "induction_scheme" derives user-specified induction rules
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from wellfounded 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 "HOL/ex/Induction_Scheme.thy"
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for examples,
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* Records. Removed K_record, and replaced it by pure lambda term
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%x. c. The simplifier setup is now more robust against eta expansion.
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INCOMPATIBILITY: in cases explicitly referring to K_record.
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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 theorem is now given by the attribute max_clauses. Theorems that exceed this number are ignored, with a warning printed.
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* Sledgehammer no longer produces structured proofs by default. To enable, 
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declare [[sledgehammer_full = true]]. Attributes reconstruction_modulus,  
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reconstruction_sorts renamed sledgehammer_modulus, sledgehammer_sorts. 
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INCOMPATIBILITY.
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*** ZF ***
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* Renamed theories:
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  Datatype.thy  -> Datatype_ZF.thy
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  Inductive.thy -> Inductive_ZF.thy
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  Int.thy       -> Int_ZF.thy
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  IntDiv.thy    -> IntDiv_ZF.thy
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  Nat.thy       -> Nat_ZF.thy
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  List.thy      -> List_ZF.thy
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  Main.thy      -> Main_ZF.thy
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 This is to allow to load both ZF and HOL in the same session.
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 INCOMPATIBILITY: ZF theories that import individual theories below
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 Main might need to be adapted. For compatibility, a new 
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 "theory Main imports Main_ZF begin end" is provided, so if you just
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 imported "Main", no changes are needed.
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*** ML ***
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* Functor NamedThmsFun: data is available to the user as dynamic fact
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(of the same name).
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* Removed obsolete "use_legacy_bindings" function.  INCOMPATIBILITY.
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* ML within Isar: antiquotation @{const name} or @{const
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name(typargs)} produces statically-checked Const term.
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* The ``print mode'' is now a thread-local value derived from a global
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template (the former print_mode reference), thus access becomes
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non-critical.  The global print_mode reference is for session
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management only; user-code should use print_mode_value,
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print_mode_active, PrintMode.setmp etc.  INCOMPATIBILITY.
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* system/system_out provides a robust way to invoke external shell
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commands, with propagation of interrupts (after Poly/ML 5.2).  Do not
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use OS.Process.system etc. directly.
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*** System ***
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* YXML notation provides a simple and efficient alternative to
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standard XML transfer syntax.  See src/Pure/General/yxml.ML and
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isatool yxml as described in the Isabelle system manual.
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* Removed obsolete THIS_IS_ISABELLE_BUILD feature.  NB: the documented
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way of changing the user's settings is via
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ISABELLE_HOME_USER/etc/settings, which is a fully featured bash
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script.
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* Default settings: PROOFGENERAL_OPTIONS no longer impose xemacs ---
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in accordance with Proof General 3.7, which prefers GNU emacs.
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* Multithreading.max_threads := 0 refers to the number of actual CPU
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cores of the underlying machine, which is a good starting point for
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optimal performance tuning.  The corresponding usedir option -M allows
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"max" as an alias for "0".  WARNING: does not work on certain versions
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of Mac OS (with Poly/ML 5.1).
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* isatool tty runs Isabelle process with plain tty interaction;
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optional line editor may be specified via ISABELLE_LINE_EDITOR
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setting, the default settings attempt to locate "ledit" and "rlwrap".
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* isatool browser now works with Cygwin as well, using general
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"javapath" function defined in Isabelle process environment.
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* isabelle-process: non-ML sessions are run with "nice", to prevent
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Isabelle from flooding interactive front-ends (notably ProofGeneral /
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XEmacs).
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* JVM class isabelle.IsabelleProcess (located in Isabelle/lib/classes)
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provides general wrapper for managing an Isabelle process in a robust
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fashion, with ``cooked'' output from stdin/stderr.
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* Rudimentary Isabelle plugin for jEdit (see Isabelle/lib/jedit),
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based on Isabelle/JVM process wrapper (see Isabelle/lib/classes).
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New in Isabelle2007 (November 2007)
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-----------------------------------
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*** General ***
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* More uniform information about legacy features, notably a
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warning/error of "Legacy feature: ...", depending on the state of the
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tolerate_legacy_features flag (default true). FUTURE INCOMPATIBILITY:
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legacy features will disappear eventually.
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* Theory syntax: the header format ``theory A = B + C:'' has been
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discontinued in favour of ``theory A imports B C begin''.  Use isatool
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fixheaders to convert existing theory files.  INCOMPATIBILITY.
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* Theory syntax: the old non-Isar theory file format has been
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discontinued altogether.  Note that ML proof scripts may still be used
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with Isar theories; migration is usually quite simple with the ML
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function use_legacy_bindings.  INCOMPATIBILITY.
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* Theory syntax: some popular names (e.g. 'class', 'declaration',
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'fun', 'help', 'if') are now keywords.  INCOMPATIBILITY, use double
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quotes.
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* Theory loader: be more serious about observing the static theory
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header specifications (including optional directories), but not the
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accidental file locations of previously successful loads.  The strict
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update policy of former update_thy is now already performed by
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use_thy, so the former has been removed; use_thys updates several
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theories simultaneously, just as 'imports' within a theory header
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specification, but without merging the results.  Potential
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INCOMPATIBILITY: may need to refine theory headers and commands
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ROOT.ML which depend on load order.
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* Theory loader: optional support for content-based file
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identification, instead of the traditional scheme of full physical
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path plus date stamp; configured by the ISABELLE_FILE_IDENT setting
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(cf. the system manual).  The new scheme allows to work with
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   344
non-finished theories in persistent session images, such that source
wenzelm@23888
   345
files may be moved later on without requiring reloads.
wenzelm@23888
   346
wenzelm@24187
   347
* Theory loader: old-style ML proof scripts being *attached* to a thy
wenzelm@24187
   348
file (with the same base name as the theory) are considered a legacy
wenzelm@24800
   349
feature, which will disappear eventually. Even now, the theory loader
wenzelm@24800
   350
no longer maintains dependencies on such files.
wenzelm@24800
   351
wenzelm@24800
   352
* Syntax: the scope for resolving ambiguities via type-inference is
wenzelm@24800
   353
now limited to individual terms, instead of whole simultaneous
wenzelm@24234
   354
specifications as before. This greatly reduces the complexity of the
wenzelm@24234
   355
syntax module and improves flexibility by separating parsing and
wenzelm@24234
   356
type-checking. INCOMPATIBILITY: additional type-constraints (explicit
wenzelm@24234
   357
'fixes' etc.) are required in rare situations.
wenzelm@24234
   358
wenzelm@25034
   359
* Syntax: constants introduced by new-style packages ('definition',
wenzelm@25034
   360
'abbreviation' etc.) are passed through the syntax module in
wenzelm@25034
   361
``authentic mode''. This means that associated mixfix annotations
wenzelm@25034
   362
really stick to such constants, independently of potential name space
wenzelm@25034
   363
ambiguities introduced later on. INCOMPATIBILITY: constants in parse
wenzelm@25034
   364
trees are represented slightly differently, may need to adapt syntax
wenzelm@25034
   365
translations accordingly. Use CONST marker in 'translations' and
wenzelm@25034
   366
@{const_syntax} antiquotation in 'parse_translation' etc.
wenzelm@25034
   367
wenzelm@17981
   368
* Legacy goal package: reduced interface to the bare minimum required
wenzelm@17981
   369
to keep existing proof scripts running.  Most other user-level
wenzelm@17981
   370
functions are now part of the OldGoals structure, which is *not* open
wenzelm@17981
   371
by default (consider isatool expandshort before open OldGoals).
wenzelm@17981
   372
Removed top_sg, prin, printyp, pprint_term/typ altogether, because
wenzelm@17981
   373
these tend to cause confusion about the actual goal (!) context being
wenzelm@17981
   374
used here, which is not necessarily the same as the_context().
wenzelm@17918
   375
wenzelm@23379
   376
* Command 'find_theorems': supports "*" wild-card in "name:"
wenzelm@23379
   377
criterion; "with_dups" option.  Certain ProofGeneral versions might
wenzelm@23379
   378
support a specific search form (see ProofGeneral/CHANGES).
webertj@22965
   379
wenzelm@20370
   380
* The ``prems limit'' option (cf. ProofContext.prems_limit) is now -1
wenzelm@20370
   381
by default, which means that "prems" (and also "fixed variables") are
wenzelm@20370
   382
suppressed from proof state output.  Note that the ProofGeneral
wenzelm@20370
   383
settings mechanism allows to change and save options persistently, but
wenzelm@20370
   384
older versions of Isabelle will fail to start up if a negative prems
wenzelm@20370
   385
limit is imposed.
wenzelm@20370
   386
wenzelm@21308
   387
* Local theory targets may be specified by non-nested blocks of
wenzelm@21308
   388
``context/locale/class ... begin'' followed by ``end''.  The body may
wenzelm@21308
   389
contain definitions, theorems etc., including any derived mechanism
wenzelm@21308
   390
that has been implemented on top of these primitives.  This concept
wenzelm@21308
   391
generalizes the existing ``theorem (in ...)'' towards more versatility
wenzelm@21308
   392
and scalability.
wenzelm@21308
   393
wenzelm@21960
   394
* Proof General interface: proper undo of final 'end' command;
wenzelm@21960
   395
discontinued Isabelle/classic mode (ML proof scripts).
wenzelm@21960
   396
wenzelm@17754
   397
wenzelm@17865
   398
*** Document preparation ***
wenzelm@17865
   399
wenzelm@21717
   400
* Added antiquotation @{theory name} which prints the given name,
wenzelm@21717
   401
after checking that it refers to a valid ancestor theory in the
wenzelm@21717
   402
current context.
haftmann@21339
   403
wenzelm@17869
   404
* Added antiquotations @{ML_type text} and @{ML_struct text} which
wenzelm@17869
   405
check the given source text as ML type/structure, printing verbatim.
wenzelm@17865
   406
wenzelm@21717
   407
* Added antiquotation @{abbrev "c args"} which prints the abbreviation
wenzelm@21717
   408
"c args == rhs" given in the current context.  (Any number of
wenzelm@21735
   409
arguments may be given on the LHS.)
wenzelm@21717
   410
wenzelm@21717
   411
wenzelm@17779
   412
*** Pure ***
wenzelm@17779
   413
wenzelm@24800
   414
* The 'class' package offers a combination of axclass and locale to
wenzelm@25129
   415
achieve Haskell-like type classes in Isabelle.  Definitions and
wenzelm@25129
   416
theorems within a class context produce both relative results (with
wenzelm@25129
   417
implicit parameters according to the locale context), and polymorphic
wenzelm@25129
   418
constants with qualified polymorphism (according to the class
wenzelm@25129
   419
context).  Within the body context of a 'class' target, a separate
wenzelm@25129
   420
syntax layer ("user space type system") takes care of converting
wenzelm@25129
   421
between global polymorphic consts and internal locale representation.
wenzelm@25177
   422
See src/HOL/ex/Classpackage.thy for examples (as well as main HOL).
haftmann@25184
   423
"isatool doc classes" provides a tutorial.
wenzelm@20807
   424
haftmann@25199
   425
* Generic code generator framework allows to generate executable
wenzelm@24800
   426
code for ML and Haskell (including Isabelle classes).  A short usage
wenzelm@24800
   427
sketch:
haftmann@20188
   428
haftmann@20188
   429
    internal compilation:
haftmann@25199
   430
        export_code <list of constants (term syntax)> in SML
haftmann@20453
   431
    writing SML code to a file:
haftmann@25199
   432
        export_code <list of constants (term syntax)> in SML <filename>
haftmann@22735
   433
    writing OCaml code to a file:
haftmann@25199
   434
        export_code <list of constants (term syntax)> in OCaml <filename>
haftmann@20188
   435
    writing Haskell code to a bunch of files:
haftmann@25199
   436
        export_code <list of constants (term syntax)> in Haskell <filename>
haftmann@25199
   437
haftmann@25199
   438
    evaluating closed propositions to True/False using code generation:
haftmann@25184
   439
        method ``eval''
haftmann@25184
   440
haftmann@25184
   441
Reasonable default setup of framework in HOL.
haftmann@20453
   442
haftmann@20453
   443
Theorem attributs for selecting and transforming function equations theorems:
haftmann@20453
   444
haftmann@22845
   445
    [code fun]:        select a theorem as function equation for a specific constant
haftmann@22845
   446
    [code fun del]:    deselect a theorem as function equation for a specific constant
haftmann@22845
   447
    [code inline]:     select an equation theorem for unfolding (inlining) in place
haftmann@22845
   448
    [code inline del]: deselect an equation theorem for unfolding (inlining) in place
haftmann@20453
   449
haftmann@22735
   450
User-defined serializations (target in {SML, OCaml, Haskell}):
haftmann@20453
   451
haftmann@20453
   452
    code_const <and-list of constants (term syntax)>
haftmann@20453
   453
      {(target) <and-list of const target syntax>}+
haftmann@20453
   454
haftmann@20453
   455
    code_type <and-list of type constructors>
haftmann@20453
   456
      {(target) <and-list of type target syntax>}+
haftmann@20453
   457
haftmann@20453
   458
    code_instance <and-list of instances>
haftmann@20453
   459
      {(target)}+
haftmann@20453
   460
        where instance ::= <type constructor> :: <class>
haftmann@20453
   461
haftmann@20453
   462
    code_class <and_list of classes>
haftmann@20453
   463
      {(target) <and-list of class target syntax>}+
haftmann@20453
   464
        where class target syntax ::= <class name> {where {<classop> == <target syntax>}+}?
haftmann@20453
   465
haftmann@25199
   466
code_instance and code_class only are effective to target Haskell.
haftmann@22735
   467
wenzelm@25177
   468
For example usage see src/HOL/ex/Codegenerator.thy and
wenzelm@25177
   469
src/HOL/ex/Codegenerator_Pretty.thy.  A separate tutorial on code
wenzelm@24800
   470
generation from Isabelle/HOL theories is available via "isatool doc
wenzelm@24800
   471
codegen".
haftmann@20188
   472
wenzelm@25129
   473
* Code generator: consts in 'consts_code' Isar commands are now
wenzelm@25129
   474
referred to by usual term syntax (including optional type
wenzelm@25129
   475
annotations).
wenzelm@25129
   476
wenzelm@19254
   477
* Command 'no_translations' removes translation rules from theory
wenzelm@19254
   478
syntax.
wenzelm@19254
   479
wenzelm@19625
   480
* Overloaded definitions are now actually checked for acyclic
wenzelm@19714
   481
dependencies.  The overloading scheme is slightly more general than
wenzelm@19714
   482
that of Haskell98, although Isabelle does not demand an exact
wenzelm@19714
   483
correspondence to type class and instance declarations.
wenzelm@19714
   484
INCOMPATIBILITY, use ``defs (unchecked overloaded)'' to admit more
wenzelm@19714
   485
exotic versions of overloading -- at the discretion of the user!
wenzelm@19711
   486
wenzelm@19711
   487
Polymorphic constants are represented via type arguments, i.e. the
wenzelm@19711
   488
instantiation that matches an instance against the most general
wenzelm@19711
   489
declaration given in the signature.  For example, with the declaration
wenzelm@19711
   490
c :: 'a => 'a => 'a, an instance c :: nat => nat => nat is represented
wenzelm@19711
   491
as c(nat).  Overloading is essentially simultaneous structural
wenzelm@19711
   492
recursion over such type arguments.  Incomplete specification patterns
wenzelm@19714
   493
impose global constraints on all occurrences, e.g. c('a * 'a) on the
wenzelm@19715
   494
LHS means that more general c('a * 'b) will be disallowed on any RHS.
wenzelm@19714
   495
Command 'print_theory' outputs the normalized system of recursive
wenzelm@19714
   496
equations, see section "definitions".
wenzelm@19625
   497
wenzelm@24086
   498
* Configuration options are maintained within the theory or proof
wenzelm@24086
   499
context (with name and type bool/int/string), providing a very simple
wenzelm@24086
   500
interface to a poor-man's version of general context data.  Tools may
wenzelm@24110
   501
declare options in ML (e.g. using Attrib.config_int) and then refer to
wenzelm@24110
   502
these values using Config.get etc.  Users may change options via an
wenzelm@24110
   503
associated attribute of the same name.  This form of context
wenzelm@24110
   504
declaration works particularly well with commands 'declare' or
wenzelm@24110
   505
'using', for example ``declare [[foo = 42]]''.  Thus it has become
wenzelm@24110
   506
very easy to avoid global references, which would not observe Isar
wenzelm@24110
   507
toplevel undo/redo and fail to work with multithreading.
wenzelm@24086
   508
wenzelm@24172
   509
Various global ML references of Pure and HOL have been turned into
wenzelm@24172
   510
configuration options:
wenzelm@24172
   511
wenzelm@24172
   512
  Unify.search_bound		unify_search_bound
wenzelm@24172
   513
  Unify.trace_bound		unify_trace_bound
wenzelm@24172
   514
  Unify.trace_simp		unify_trace_simp
wenzelm@24172
   515
  Unify.trace_types		unify_trace_types
wenzelm@24172
   516
  Simplifier.simp_depth_limit	simp_depth_limit
wenzelm@24172
   517
  Blast.depth_limit		blast_depth_limit
wenzelm@24172
   518
  DatatypeProp.dtK		datatype_distinctness_limit
wenzelm@24172
   519
  fast_arith_neq_limit  	fast_arith_neq_limit
wenzelm@24172
   520
  fast_arith_split_limit	fast_arith_split_limit
wenzelm@24172
   521
wenzelm@24086
   522
* Named collections of theorems may be easily installed as context
wenzelm@24800
   523
data using the functor NamedThmsFun (see also
wenzelm@24086
   524
src/Pure/Tools/named_thms.ML).  The user may add or delete facts via
wenzelm@24110
   525
attributes; there is also a toplevel print command.  This facility is
wenzelm@24110
   526
just a common case of general context data, which is the preferred way
wenzelm@24110
   527
for anything more complex than just a list of facts in canonical
wenzelm@24110
   528
order.
wenzelm@24086
   529
wenzelm@24032
   530
* Isar: command 'declaration' augments a local theory by generic
wenzelm@24032
   531
declaration functions written in ML.  This enables arbitrary content
wenzelm@24032
   532
being added to the context, depending on a morphism that tells the
wenzelm@24032
   533
difference of the original declaration context wrt. the application
wenzelm@24032
   534
context encountered later on.
wenzelm@24032
   535
wenzelm@24032
   536
* Isar: proper interfaces for simplification procedures.  Command
wenzelm@24032
   537
'simproc_setup' declares named simprocs (with match patterns, and body
wenzelm@24032
   538
text in ML).  Attribute "simproc" adds/deletes simprocs in the current
wenzelm@24032
   539
context.  ML antiquotation @{simproc name} retrieves named simprocs.
wenzelm@24032
   540
wenzelm@24032
   541
* Isar: an extra pair of brackets around attribute declarations
wenzelm@24032
   542
abbreviates a theorem reference involving an internal dummy fact,
wenzelm@24032
   543
which will be ignored later --- only the effect of the attribute on
wenzelm@24032
   544
the background context will persist.  This form of in-place
wenzelm@24032
   545
declarations is particularly useful with commands like 'declare' and
wenzelm@24032
   546
'using', for example ``have A using [[simproc a]] by simp''.
wenzelm@24032
   547
wenzelm@23369
   548
* Isar: method "assumption" (and implicit closing of subproofs) now
wenzelm@23369
   549
takes simple non-atomic goal assumptions into account: after applying
wenzelm@23369
   550
an assumption as a rule the resulting subgoals are solved by atomic
wenzelm@23369
   551
assumption steps.  This is particularly useful to finish 'obtain'
wenzelm@23369
   552
goals, such as "!!x. (!!x. P x ==> thesis) ==> P x ==> thesis",
wenzelm@23369
   553
without referring to the original premise "!!x. P x ==> thesis" in the
wenzelm@23369
   554
Isar proof context.  POTENTIAL INCOMPATIBILITY: method "assumption" is
wenzelm@23369
   555
more permissive.
wenzelm@23369
   556
wenzelm@23369
   557
* Isar: implicit use of prems from the Isar proof context is
wenzelm@23369
   558
considered a legacy feature.  Common applications like ``have A .''
wenzelm@23369
   559
may be replaced by ``have A by fact'' or ``note `A`''.  In general,
wenzelm@23369
   560
referencing facts explicitly here improves readability and
wenzelm@23369
   561
maintainability of proof texts.
wenzelm@23369
   562
wenzelm@17865
   563
* Isar: improper proof element 'guess' is like 'obtain', but derives
wenzelm@17865
   564
the obtained context from the course of reasoning!  For example:
wenzelm@17865
   565
wenzelm@17865
   566
  assume "EX x y. A x & B y"   -- "any previous fact"
wenzelm@17865
   567
  then guess x and y by clarify
wenzelm@17865
   568
wenzelm@17865
   569
This technique is potentially adventurous, depending on the facts and
wenzelm@17865
   570
proof tools being involved here.
wenzelm@17865
   571
wenzelm@18020
   572
* Isar: known facts from the proof context may be specified as literal
wenzelm@18020
   573
propositions, using ASCII back-quote syntax.  This works wherever
wenzelm@18020
   574
named facts used to be allowed so far, in proof commands, proof
wenzelm@18020
   575
methods, attributes etc.  Literal facts are retrieved from the context
wenzelm@18020
   576
according to unification of type and term parameters.  For example,
wenzelm@18020
   577
provided that "A" and "A ==> B" and "!!x. P x ==> Q x" are known
wenzelm@18020
   578
theorems in the current context, then these are valid literal facts:
wenzelm@18020
   579
`A` and `A ==> B` and `!!x. P x ==> Q x" as well as `P a ==> Q a` etc.
wenzelm@18020
   580
wenzelm@18020
   581
There is also a proof method "fact" which does the same composition
wenzelm@18044
   582
for explicit goal states, e.g. the following proof texts coincide with
wenzelm@18044
   583
certain special cases of literal facts:
wenzelm@18020
   584
wenzelm@18020
   585
  have "A" by fact                 ==  note `A`
wenzelm@18020
   586
  have "A ==> B" by fact           ==  note `A ==> B`
wenzelm@18020
   587
  have "!!x. P x ==> Q x" by fact  ==  note `!!x. P x ==> Q x`
wenzelm@18020
   588
  have "P a ==> Q a" by fact       ==  note `P a ==> Q a`
wenzelm@18020
   589
wenzelm@20118
   590
* Isar: ":" (colon) is no longer a symbolic identifier character in
wenzelm@20118
   591
outer syntax.  Thus symbolic identifiers may be used without
wenzelm@20118
   592
additional white space in declarations like this: ``assume *: A''.
wenzelm@20118
   593
wenzelm@20013
   594
* Isar: 'print_facts' prints all local facts of the current context,
wenzelm@20013
   595
both named and unnamed ones.
wenzelm@20013
   596
wenzelm@18308
   597
* Isar: 'def' now admits simultaneous definitions, e.g.:
wenzelm@18308
   598
wenzelm@18308
   599
  def x == "t" and y == "u"
wenzelm@18308
   600
wenzelm@18540
   601
* Isar: added command 'unfolding', which is structurally similar to
wenzelm@18540
   602
'using', but affects both the goal state and facts by unfolding given
wenzelm@18815
   603
rewrite rules.  Thus many occurrences of the 'unfold' method or
wenzelm@18540
   604
'unfolded' attribute may be replaced by first-class proof text.
wenzelm@18540
   605
wenzelm@18815
   606
* Isar: methods 'unfold' / 'fold', attributes 'unfolded' / 'folded',
wenzelm@18815
   607
and command 'unfolding' now all support object-level equalities
wenzelm@18815
   608
(potentially conditional).  The underlying notion of rewrite rule is
wenzelm@18815
   609
analogous to the 'rule_format' attribute, but *not* that of the
wenzelm@18815
   610
Simplifier (which is usually more generous).
wenzelm@18815
   611
kleing@24238
   612
* Isar: the new attribute [rotated n] (default n = 1) rotates the
kleing@24238
   613
premises of a theorem by n. Useful in conjunction with drule.
kleing@24238
   614
wenzelm@19220
   615
* Isar: the goal restriction operator [N] (default N = 1) evaluates a
wenzelm@19220
   616
method expression within a sandbox consisting of the first N
wenzelm@19240
   617
sub-goals, which need to exist.  For example, ``simp_all [3]''
wenzelm@19240
   618
simplifies the first three sub-goals, while (rule foo, simp_all)[]
wenzelm@19240
   619
simplifies all new goals that emerge from applying rule foo to the
wenzelm@19240
   620
originally first one.
wenzelm@19220
   621
wenzelm@19814
   622
* Isar: schematic goals are no longer restricted to higher-order
wenzelm@19814
   623
patterns; e.g. ``lemma "?P(?x)" by (rule TrueI)'' now works as
wenzelm@19814
   624
expected.
wenzelm@19814
   625
wenzelm@18901
   626
* Isar: the conclusion of a long theorem statement is now either
wenzelm@18901
   627
'shows' (a simultaneous conjunction, as before), or 'obtains'
wenzelm@18901
   628
(essentially a disjunction of cases with local parameters and
wenzelm@18901
   629
assumptions).  The latter allows to express general elimination rules
wenzelm@18910
   630
adequately; in this notation common elimination rules look like this:
wenzelm@18901
   631
wenzelm@18901
   632
  lemma exE:    -- "EX x. P x ==> (!!x. P x ==> thesis) ==> thesis"
wenzelm@18901
   633
    assumes "EX x. P x"
wenzelm@18901
   634
    obtains x where "P x"
wenzelm@18901
   635
wenzelm@18901
   636
  lemma conjE:  -- "A & B ==> (A ==> B ==> thesis) ==> thesis"
wenzelm@18901
   637
    assumes "A & B"
wenzelm@18901
   638
    obtains A and B
wenzelm@18901
   639
wenzelm@18901
   640
  lemma disjE:  -- "A | B ==> (A ==> thesis) ==> (B ==> thesis) ==> thesis"
wenzelm@18901
   641
    assumes "A | B"
wenzelm@18901
   642
    obtains
wenzelm@18901
   643
      A
wenzelm@18901
   644
    | B
wenzelm@18901
   645
wenzelm@18910
   646
The subsequent classical rules even refer to the formal "thesis"
wenzelm@18901
   647
explicitly:
wenzelm@18901
   648
wenzelm@18901
   649
  lemma classical:     -- "(~ thesis ==> thesis) ==> thesis"
wenzelm@18901
   650
    obtains "~ thesis"
wenzelm@18901
   651
wenzelm@18910
   652
  lemma Peirce's_Law:  -- "((thesis ==> something) ==> thesis) ==> thesis"
wenzelm@18910
   653
    obtains "thesis ==> something"
wenzelm@18901
   654
wenzelm@18901
   655
The actual proof of an 'obtains' statement is analogous to that of the
wenzelm@18910
   656
Isar proof element 'obtain', only that there may be several cases.
wenzelm@18910
   657
Optional case names may be specified in parentheses; these will be
wenzelm@18910
   658
available both in the present proof and as annotations in the
wenzelm@18910
   659
resulting rule, for later use with the 'cases' method (cf. attribute
wenzelm@18910
   660
case_names).
wenzelm@18901
   661
wenzelm@21447
   662
* Isar: the assumptions of a long theorem statement are available as
wenzelm@21447
   663
"assms" fact in the proof context.  This is more appropriate than the
wenzelm@21447
   664
(historical) "prems", which refers to all assumptions of the current
wenzelm@21447
   665
context, including those from the target locale, proof body etc.
wenzelm@21447
   666
wenzelm@19263
   667
* Isar: 'print_statement' prints theorems from the current theory or
wenzelm@19263
   668
proof context in long statement form, according to the syntax of a
wenzelm@19263
   669
top-level lemma.
wenzelm@19263
   670
wenzelm@18901
   671
* Isar: 'obtain' takes an optional case name for the local context
wenzelm@18901
   672
introduction rule (default "that").
wenzelm@18901
   673
wenzelm@19587
   674
* Isar: removed obsolete 'concl is' patterns.  INCOMPATIBILITY, use
wenzelm@19587
   675
explicit (is "_ ==> ?foo") in the rare cases where this still happens
wenzelm@19587
   676
to occur.
wenzelm@19587
   677
wenzelm@19682
   678
* Pure: syntax "CONST name" produces a fully internalized constant
wenzelm@19682
   679
according to the current context.  This is particularly useful for
wenzelm@19682
   680
syntax translations that should refer to internal constant
wenzelm@19682
   681
representations independently of name spaces.
wenzelm@19682
   682
wenzelm@21537
   683
* Pure: syntax constant for foo (binder "FOO ") is called "foo_binder"
wenzelm@21537
   684
instead of "FOO ". This allows multiple binder declarations to coexist
wenzelm@21537
   685
in the same context.  INCOMPATIBILITY.
wenzelm@21537
   686
wenzelm@21209
   687
* Isar/locales: 'notation' provides a robust interface to the 'syntax'
wenzelm@21209
   688
primitive that also works in a locale context (both for constants and
wenzelm@24950
   689
fixed variables). Type declaration and internal syntactic representation
wenzelm@24950
   690
of given constants retrieved from the context. Likewise, the
wenzelm@24950
   691
'no_notation' command allows to remove given syntax annotations from the
wenzelm@24950
   692
current context.
wenzelm@19682
   693
wenzelm@19665
   694
* Isar/locales: new derived specification elements 'axiomatization',
wenzelm@19665
   695
'definition', 'abbreviation', which support type-inference, admit
wenzelm@19083
   696
object-level specifications (equality, equivalence).  See also the
wenzelm@19083
   697
isar-ref manual.  Examples:
wenzelm@19081
   698
wenzelm@19665
   699
  axiomatization
wenzelm@21595
   700
    eq  (infix "===" 50) where
wenzelm@21595
   701
    eq_refl: "x === x" and eq_subst: "x === y ==> P x ==> P y"
wenzelm@21595
   702
wenzelm@21595
   703
  definition "f x y = x + y + 1"
wenzelm@21595
   704
  definition g where "g x = f x x"
wenzelm@19081
   705
wenzelm@19363
   706
  abbreviation
wenzelm@21595
   707
    neq  (infix "=!=" 50) where
wenzelm@19363
   708
    "x =!= y == ~ (x === y)"
wenzelm@19081
   709
wenzelm@19083
   710
These specifications may be also used in a locale context.  Then the
wenzelm@19083
   711
constants being introduced depend on certain fixed parameters, and the
wenzelm@19083
   712
constant name is qualified by the locale base name.  An internal
wenzelm@19083
   713
abbreviation takes care for convenient input and output, making the
wenzelm@19088
   714
parameters implicit and using the original short name.  See also
wenzelm@25177
   715
src/HOL/ex/Abstract_NAT.thy for an example of deriving polymorphic
wenzelm@19083
   716
entities from a monomorphic theory.
wenzelm@19083
   717
wenzelm@19083
   718
Presently, abbreviations are only available 'in' a target locale, but
wenzelm@19363
   719
not inherited by general import expressions.  Also note that
wenzelm@19363
   720
'abbreviation' may be used as a type-safe replacement for 'syntax' +
wenzelm@24735
   721
'translations' in common applications.  The "no_abbrevs" print mode
wenzelm@24735
   722
prevents folding of abbreviations in term output.
wenzelm@19084
   723
wenzelm@19682
   724
Concrete syntax is attached to specified constants in internal form,
wenzelm@19682
   725
independently of name spaces.  The parse tree representation is
wenzelm@21209
   726
slightly different -- use 'notation' instead of raw 'syntax', and
wenzelm@19682
   727
'translations' with explicit "CONST" markup to accommodate this.
wenzelm@19665
   728
wenzelm@24800
   729
* Pure/Isar: unified syntax for new-style specification mechanisms
wenzelm@24800
   730
(e.g.  'definition', 'abbreviation', or 'inductive' in HOL) admits
wenzelm@24800
   731
full type inference and dummy patterns ("_").  For example:
wenzelm@24735
   732
wenzelm@24735
   733
  definition "K x _ = x"
wenzelm@24735
   734
wenzelm@24738
   735
  inductive conj for A B
wenzelm@24738
   736
  where "A ==> B ==> conj A B"
wenzelm@24738
   737
wenzelm@21735
   738
* Pure: command 'print_abbrevs' prints all constant abbreviations of
wenzelm@21735
   739
the current context.  Print mode "no_abbrevs" prevents inversion of
wenzelm@21735
   740
abbreviations on output.
wenzelm@21735
   741
wenzelm@24800
   742
* Isar/locales: improved parameter handling: use of locales "var" and
wenzelm@24800
   743
"struct" no longer necessary; - parameter renamings are no longer
wenzelm@24800
   744
required to be injective.  For example, this allows to define
wenzelm@24800
   745
endomorphisms as locale endom = homom mult mult h.
ballarin@19783
   746
ballarin@19931
   747
* Isar/locales: changed the way locales with predicates are defined.
ballarin@19931
   748
Instead of accumulating the specification, the imported expression is
wenzelm@22126
   749
now an interpretation.  INCOMPATIBILITY: different normal form of
wenzelm@22126
   750
locale expressions.  In particular, in interpretations of locales with
wenzelm@22126
   751
predicates, goals repesenting already interpreted fragments are not
wenzelm@22126
   752
removed automatically.  Use methods `intro_locales' and
wenzelm@22126
   753
`unfold_locales'; see below.
wenzelm@22126
   754
wenzelm@22126
   755
* Isar/locales: new methods `intro_locales' and `unfold_locales'
wenzelm@22126
   756
provide backward reasoning on locales predicates.  The methods are
wenzelm@22126
   757
aware of interpretations and discharge corresponding goals.
wenzelm@22126
   758
`intro_locales' is less aggressive then `unfold_locales' and does not
wenzelm@22126
   759
unfold predicates to assumptions.
ballarin@19931
   760
ballarin@19931
   761
* Isar/locales: the order in which locale fragments are accumulated
wenzelm@22126
   762
has changed.  This enables to override declarations from fragments due
wenzelm@22126
   763
to interpretations -- for example, unwanted simp rules.
ballarin@19931
   764
ballarin@23920
   765
* Isar/locales: interpretation in theories and proof contexts has been
ballarin@23920
   766
extended.  One may now specify (and prove) equations, which are
ballarin@23920
   767
unfolded in interpreted theorems.  This is useful for replacing
ballarin@23920
   768
defined concepts (constants depending on locale parameters) by
ballarin@23920
   769
concepts already existing in the target context.  Example:
ballarin@23920
   770
ballarin@23920
   771
  interpretation partial_order ["op <= :: [int, int] => bool"]
ballarin@23920
   772
    where "partial_order.less (op <=) (x::int) y = (x < y)"
ballarin@23920
   773
wenzelm@24800
   774
Typically, the constant `partial_order.less' is created by a
wenzelm@24800
   775
definition specification element in the context of locale
wenzelm@24800
   776
partial_order.
wenzelm@24800
   777
wenzelm@24859
   778
* Method "induct": improved internal context management to support
wenzelm@24800
   779
local fixes and defines on-the-fly. Thus explicit meta-level
wenzelm@24800
   780
connectives !!  and ==> are rarely required anymore in inductive goals
wenzelm@24800
   781
(using object-logic connectives for this purpose has been long
wenzelm@24800
   782
obsolete anyway). Common proof patterns are explained in
wenzelm@25177
   783
src/HOL/Induct/Common_Patterns.thy, see also
wenzelm@25177
   784
src/HOL/Isar_examples/Puzzle.thy and src/HOL/Lambda for realistic
wenzelm@25177
   785
examples.
wenzelm@24606
   786
wenzelm@24859
   787
* Method "induct": improved handling of simultaneous goals. Instead of
wenzelm@24606
   788
introducing object-level conjunction, the statement is now split into
wenzelm@24606
   789
several conclusions, while the corresponding symbolic cases are nested
wenzelm@24606
   790
accordingly. INCOMPATIBILITY, proofs need to be structured explicitly,
wenzelm@25177
   791
see src/HOL/Induct/Common_Patterns.thy, for example.
wenzelm@24606
   792
wenzelm@24859
   793
* Method "induct": mutual induction rules are now specified as a list
wenzelm@24800
   794
of rule sharing the same induction cases. HOL packages usually provide
wenzelm@24606
   795
foo_bar.inducts for mutually defined items foo and bar (e.g. inductive
wenzelm@24859
   796
predicates/sets or datatypes). INCOMPATIBILITY, users need to specify
wenzelm@24859
   797
mutual induction rules differently, i.e. like this:
wenzelm@18506
   798
wenzelm@18506
   799
  (induct rule: foo_bar.inducts)
wenzelm@18506
   800
  (induct set: foo bar)
wenzelm@24859
   801
  (induct pred: foo bar)
wenzelm@18506
   802
  (induct type: foo bar)
wenzelm@18506
   803
wenzelm@18506
   804
The ML function ProjectRule.projections turns old-style rules into the
wenzelm@18506
   805
new format.
wenzelm@18506
   806
wenzelm@24859
   807
* Method "coinduct": dual of induction, see
wenzelm@18399
   808
src/HOL/Library/Coinductive_List.thy for various examples.
wenzelm@18399
   809
wenzelm@24859
   810
* Method "cases", "induct", "coinduct": the ``(open)'' option is
wenzelm@24859
   811
considered a legacy feature.
wenzelm@24859
   812
wenzelm@20919
   813
* Attribute "symmetric" produces result with standardized schematic
wenzelm@20919
   814
variables (index 0).  Potential INCOMPATIBILITY.
wenzelm@20919
   815
wenzelm@22126
   816
* Simplifier: by default the simplifier trace only shows top level
wenzelm@22126
   817
rewrites now. That is, trace_simp_depth_limit is set to 1 by
wenzelm@22126
   818
default. Thus there is less danger of being flooded by the trace. The
wenzelm@22126
   819
trace indicates where parts have been suppressed.
nipkow@18674
   820
  
wenzelm@18536
   821
* Provers/classical: removed obsolete classical version of elim_format
wenzelm@18536
   822
attribute; classical elim/dest rules are now treated uniformly when
wenzelm@18536
   823
manipulating the claset.
wenzelm@18536
   824
wenzelm@18694
   825
* Provers/classical: stricter checks to ensure that supplied intro,
wenzelm@18694
   826
dest and elim rules are well-formed; dest and elim rules must have at
wenzelm@18694
   827
least one premise.
wenzelm@18694
   828
wenzelm@18694
   829
* Provers/classical: attributes dest/elim/intro take an optional
wenzelm@18695
   830
weight argument for the rule (just as the Pure versions).  Weights are
wenzelm@18696
   831
ignored by automated tools, but determine the search order of single
wenzelm@18694
   832
rule steps.
paulson@18557
   833
wenzelm@18536
   834
* Syntax: input syntax now supports dummy variable binding "%_. b",
wenzelm@18536
   835
where the body does not mention the bound variable.  Note that dummy
wenzelm@18536
   836
patterns implicitly depend on their context of bounds, which makes
wenzelm@18536
   837
"{_. _}" match any set comprehension as expected.  Potential
wenzelm@18536
   838
INCOMPATIBILITY -- parse translations need to cope with syntactic
wenzelm@18536
   839
constant "_idtdummy" in the binding position.
wenzelm@18536
   840
wenzelm@18536
   841
* Syntax: removed obsolete syntactic constant "_K" and its associated
wenzelm@18536
   842
parse translation.  INCOMPATIBILITY -- use dummy abstraction instead,
wenzelm@18536
   843
for example "A -> B" => "Pi A (%_. B)".
wenzelm@17779
   844
wenzelm@20582
   845
* Pure: 'class_deps' command visualizes the subclass relation, using
wenzelm@20582
   846
the graph browser tool.
wenzelm@20582
   847
wenzelm@24800
   848
* Pure: 'print_theory' now suppresses certain internal declarations by
wenzelm@24800
   849
default; use '!' option for full details.
wenzelm@20620
   850
wenzelm@17865
   851
nipkow@17806
   852
*** HOL ***
nipkow@17806
   853
wenzelm@25129
   854
* Method "metis" proves goals by applying the Metis general-purpose
wenzelm@25129
   855
resolution prover (see also http://gilith.com/software/metis/).
wenzelm@25129
   856
Examples are in the directory MetisExamples.  WARNING: the
wenzelm@25129
   857
Isabelle/HOL-Metis integration does not yet work properly with
wenzelm@25129
   858
multi-threading.
wenzelm@25129
   859
  
wenzelm@25129
   860
* Command 'sledgehammer' invokes external automatic theorem provers as
wenzelm@25129
   861
background processes.  It generates calls to the "metis" method if
wenzelm@25129
   862
successful. These can be pasted into the proof.  Users do not have to
wenzelm@25129
   863
wait for the automatic provers to return.  WARNING: does not really
wenzelm@25129
   864
work with multi-threading.
wenzelm@25129
   865
wenzelm@24804
   866
* New "auto_quickcheck" feature tests outermost goal statements for
wenzelm@24804
   867
potential counter-examples.  Controlled by ML references
wenzelm@24804
   868
auto_quickcheck (default true) and auto_quickcheck_time_limit (default
wenzelm@25129
   869
5000 milliseconds).  Fails silently if statements is outside of
wenzelm@25129
   870
executable fragment, or any other codgenerator problem occurs.
wenzelm@24804
   871
haftmann@25184
   872
* New constant "undefined" with axiom "undefined x = undefined".
haftmann@25184
   873
haftmann@25184
   874
* Added class "HOL.eq", allowing for code generation with polymorphic
haftmann@25184
   875
equality.
haftmann@25184
   876
haftmann@25184
   877
* Some renaming of class constants due to canonical name prefixing in
haftmann@25184
   878
the new 'class' package:
haftmann@25184
   879
haftmann@25184
   880
    HOL.abs ~> HOL.abs_class.abs
haftmann@25184
   881
    HOL.divide ~> HOL.divide_class.divide
haftmann@25184
   882
    0 ~> HOL.zero_class.zero
haftmann@25184
   883
    1 ~> HOL.one_class.one
haftmann@25184
   884
    op + ~> HOL.plus_class.plus
haftmann@25184
   885
    op - ~> HOL.minus_class.minus
haftmann@25184
   886
    uminus ~> HOL.minus_class.uminus
haftmann@25184
   887
    op * ~> HOL.times_class.times
haftmann@25184
   888
    op < ~> HOL.ord_class.less
haftmann@25184
   889
    op <= > HOL.ord_class.less_eq
haftmann@25184
   890
    Nat.power ~> Power.power_class.power
haftmann@25184
   891
    Nat.size ~> Nat.size_class.size
haftmann@25184
   892
    Numeral.number_of ~> Numeral.number_class.number_of
haftmann@25184
   893
    FixedPoint.Inf ~> Lattices.complete_lattice_class.Inf
haftmann@25184
   894
    FixedPoint.Sup ~> Lattices.complete_lattice_class.Sup
haftmann@25184
   895
    Orderings.min ~> Orderings.ord_class.min
haftmann@25184
   896
    Orderings.max ~> Orderings.ord_class.max
haftmann@25184
   897
    Divides.op div ~> Divides.div_class.div
haftmann@25184
   898
    Divides.op mod ~> Divides.div_class.mod
haftmann@25184
   899
    Divides.op dvd ~> Divides.div_class.dvd
haftmann@25184
   900
haftmann@25184
   901
INCOMPATIBILITY.  Adaptions may be required in the following cases:
haftmann@25184
   902
haftmann@25184
   903
a) User-defined constants using any of the names "plus", "minus",
haftmann@25184
   904
"times", "less" or "less_eq". The standard syntax translations for
haftmann@25184
   905
"+", "-" and "*" may go wrong.  INCOMPATIBILITY: use more specific
haftmann@25184
   906
names.
haftmann@25184
   907
haftmann@25184
   908
b) Variables named "plus", "minus", "times", "less", "less_eq"
haftmann@25184
   909
INCOMPATIBILITY: use more specific names.
haftmann@25184
   910
haftmann@25184
   911
c) Permutative equations (e.g. "a + b = b + a")
haftmann@25184
   912
Since the change of names also changes the order of terms, permutative
haftmann@25184
   913
rewrite rules may get applied in a different order. Experience shows
haftmann@25184
   914
that this is rarely the case (only two adaptions in the whole Isabelle
haftmann@25184
   915
distribution).  INCOMPATIBILITY: rewrite proofs
haftmann@25184
   916
haftmann@25184
   917
d) ML code directly refering to constant names
haftmann@25184
   918
This in general only affects hand-written proof tactics, simprocs and
haftmann@25184
   919
so on.  INCOMPATIBILITY: grep your sourcecode and replace names.
haftmann@25184
   920
Consider using @{const_name} antiquotation.
haftmann@25184
   921
haftmann@25184
   922
* New class "default" with associated constant "default".
haftmann@25184
   923
haftmann@25184
   924
* Function "sgn" is now overloaded and available on int, real, complex
haftmann@25184
   925
(and other numeric types), using class "sgn".  Two possible defs of
haftmann@25184
   926
sgn are given as equational assumptions in the classes sgn_if and
haftmann@25184
   927
sgn_div_norm; ordered_idom now also inherits from sgn_if.
haftmann@25184
   928
INCOMPATIBILITY.
haftmann@25184
   929
haftmann@25184
   930
* Locale "partial_order" now unified with class "order" (cf. theory
haftmann@25184
   931
Orderings), added parameter "less".  INCOMPATIBILITY.
haftmann@25184
   932
haftmann@25184
   933
* Renamings in classes "order" and "linorder": facts "refl", "trans" and
haftmann@25184
   934
"cases" to "order_refl", "order_trans" and "linorder_cases", to avoid
haftmann@25184
   935
clashes with HOL "refl" and "trans".  INCOMPATIBILITY.
haftmann@25184
   936
haftmann@25184
   937
* Classes "order" and "linorder": potential INCOMPATIBILITY due to
haftmann@25184
   938
changed order of proof goals in instance proofs.
haftmann@25184
   939
haftmann@25184
   940
* The transitivity reasoner for partial and linear orders is set up
haftmann@25184
   941
for classes "order" and "linorder".  Instances of the reasoner are available
haftmann@25184
   942
in all contexts importing or interpreting the corresponding locales.
haftmann@25184
   943
Method "order" invokes the reasoner separately; the reasoner
haftmann@25184
   944
is also integrated with the Simplifier as a solver.  Diagnostic
haftmann@25184
   945
command 'print_orders' shows the available instances of the reasoner
haftmann@25184
   946
in the current context.
haftmann@25184
   947
haftmann@25184
   948
* Localized monotonicity predicate in theory "Orderings"; integrated
haftmann@25184
   949
lemmas max_of_mono and min_of_mono with this predicate.
haftmann@25184
   950
INCOMPATIBILITY.
haftmann@25184
   951
haftmann@25184
   952
* Formulation of theorem "dense" changed slightly due to integration
haftmann@25184
   953
with new class dense_linear_order.
haftmann@25184
   954
haftmann@25184
   955
* Uniform lattice theory development in HOL.
haftmann@25184
   956
haftmann@25184
   957
    constants "meet" and "join" now named "inf" and "sup"
haftmann@25184
   958
    constant "Meet" now named "Inf"
haftmann@25184
   959
haftmann@25184
   960
    classes "meet_semilorder" and "join_semilorder" now named
haftmann@25184
   961
      "lower_semilattice" and "upper_semilattice"
haftmann@25184
   962
    class "lorder" now named "lattice"
haftmann@25184
   963
    class "comp_lat" now named "complete_lattice"
haftmann@25184
   964
haftmann@25184
   965
    Instantiation of lattice classes allows explicit definitions
haftmann@25184
   966
    for "inf" and "sup" operations (or "Inf" and "Sup" for complete lattices).
haftmann@25184
   967
haftmann@25184
   968
  INCOMPATIBILITY.  Theorem renames:
haftmann@25184
   969
haftmann@25184
   970
    meet_left_le            ~> inf_le1
haftmann@25184
   971
    meet_right_le           ~> inf_le2
haftmann@25184
   972
    join_left_le            ~> sup_ge1
haftmann@25184
   973
    join_right_le           ~> sup_ge2
haftmann@25184
   974
    meet_join_le            ~> inf_sup_ord
haftmann@25184
   975
    le_meetI                ~> le_infI
haftmann@25184
   976
    join_leI                ~> le_supI
haftmann@25184
   977
    le_meet                 ~> le_inf_iff
haftmann@25184
   978
    le_join                 ~> ge_sup_conv
haftmann@25184
   979
    meet_idempotent         ~> inf_idem
haftmann@25184
   980
    join_idempotent         ~> sup_idem
haftmann@25184
   981
    meet_comm               ~> inf_commute
haftmann@25184
   982
    join_comm               ~> sup_commute
haftmann@25184
   983
    meet_leI1               ~> le_infI1
haftmann@25184
   984
    meet_leI2               ~> le_infI2
haftmann@25184
   985
    le_joinI1               ~> le_supI1
haftmann@25184
   986
    le_joinI2               ~> le_supI2
haftmann@25184
   987
    meet_assoc              ~> inf_assoc
haftmann@25184
   988
    join_assoc              ~> sup_assoc
haftmann@25184
   989
    meet_left_comm          ~> inf_left_commute
haftmann@25184
   990
    meet_left_idempotent    ~> inf_left_idem
haftmann@25184
   991
    join_left_comm          ~> sup_left_commute
haftmann@25184
   992
    join_left_idempotent    ~> sup_left_idem
haftmann@25184
   993
    meet_aci                ~> inf_aci
haftmann@25184
   994
    join_aci                ~> sup_aci
haftmann@25184
   995
    le_def_meet             ~> le_iff_inf
haftmann@25184
   996
    le_def_join             ~> le_iff_sup
haftmann@25184
   997
    join_absorp2            ~> sup_absorb2
haftmann@25184
   998
    join_absorp1            ~> sup_absorb1
haftmann@25184
   999
    meet_absorp1            ~> inf_absorb1
haftmann@25184
  1000
    meet_absorp2            ~> inf_absorb2
haftmann@25184
  1001
    meet_join_absorp        ~> inf_sup_absorb
haftmann@25184
  1002
    join_meet_absorp        ~> sup_inf_absorb
haftmann@25184
  1003
    distrib_join_le         ~> distrib_sup_le
haftmann@25184
  1004
    distrib_meet_le         ~> distrib_inf_le
haftmann@25184
  1005
haftmann@25184
  1006
    add_meet_distrib_left   ~> add_inf_distrib_left
haftmann@25184
  1007
    add_join_distrib_left   ~> add_sup_distrib_left
haftmann@25184
  1008
    is_join_neg_meet        ~> is_join_neg_inf
haftmann@25184
  1009
    is_meet_neg_join        ~> is_meet_neg_sup
haftmann@25184
  1010
    add_meet_distrib_right  ~> add_inf_distrib_right
haftmann@25184
  1011
    add_join_distrib_right  ~> add_sup_distrib_right
haftmann@25184
  1012
    add_meet_join_distribs  ~> add_sup_inf_distribs
haftmann@25184
  1013
    join_eq_neg_meet        ~> sup_eq_neg_inf
haftmann@25184
  1014
    meet_eq_neg_join        ~> inf_eq_neg_sup
haftmann@25184
  1015
    add_eq_meet_join        ~> add_eq_inf_sup
haftmann@25184
  1016
    meet_0_imp_0            ~> inf_0_imp_0
haftmann@25184
  1017
    join_0_imp_0            ~> sup_0_imp_0
haftmann@25184
  1018
    meet_0_eq_0             ~> inf_0_eq_0
haftmann@25184
  1019
    join_0_eq_0             ~> sup_0_eq_0
haftmann@25184
  1020
    neg_meet_eq_join        ~> neg_inf_eq_sup
haftmann@25184
  1021
    neg_join_eq_meet        ~> neg_sup_eq_inf
haftmann@25184
  1022
    join_eq_if              ~> sup_eq_if
haftmann@25184
  1023
haftmann@25184
  1024
    mono_meet               ~> mono_inf
haftmann@25184
  1025
    mono_join               ~> mono_sup
haftmann@25184
  1026
    meet_bool_eq            ~> inf_bool_eq
haftmann@25184
  1027
    join_bool_eq            ~> sup_bool_eq
haftmann@25184
  1028
    meet_fun_eq             ~> inf_fun_eq
haftmann@25184
  1029
    join_fun_eq             ~> sup_fun_eq
haftmann@25184
  1030
    meet_set_eq             ~> inf_set_eq
haftmann@25184
  1031
    join_set_eq             ~> sup_set_eq
haftmann@25184
  1032
    meet1_iff               ~> inf1_iff
haftmann@25184
  1033
    meet2_iff               ~> inf2_iff
haftmann@25184
  1034
    meet1I                  ~> inf1I
haftmann@25184
  1035
    meet2I                  ~> inf2I
haftmann@25184
  1036
    meet1D1                 ~> inf1D1
haftmann@25184
  1037
    meet2D1                 ~> inf2D1
haftmann@25184
  1038
    meet1D2                 ~> inf1D2
haftmann@25184
  1039
    meet2D2                 ~> inf2D2
haftmann@25184
  1040
    meet1E                  ~> inf1E
haftmann@25184
  1041
    meet2E                  ~> inf2E
haftmann@25184
  1042
    join1_iff               ~> sup1_iff
haftmann@25184
  1043
    join2_iff               ~> sup2_iff
haftmann@25184
  1044
    join1I1                 ~> sup1I1
haftmann@25184
  1045
    join2I1                 ~> sup2I1
haftmann@25184
  1046
    join1I1                 ~> sup1I1
haftmann@25184
  1047
    join2I2                 ~> sup1I2
haftmann@25184
  1048
    join1CI                 ~> sup1CI
haftmann@25184
  1049
    join2CI                 ~> sup2CI
haftmann@25184
  1050
    join1E                  ~> sup1E
haftmann@25184
  1051
    join2E                  ~> sup2E
haftmann@25184
  1052
haftmann@25184
  1053
    is_meet_Meet            ~> is_meet_Inf
haftmann@25184
  1054
    Meet_bool_def           ~> Inf_bool_def
haftmann@25184
  1055
    Meet_fun_def            ~> Inf_fun_def
haftmann@25184
  1056
    Meet_greatest           ~> Inf_greatest
haftmann@25184
  1057
    Meet_lower              ~> Inf_lower
haftmann@25184
  1058
    Meet_set_def            ~> Inf_set_def
haftmann@25184
  1059
haftmann@25184
  1060
    Sup_def                 ~> Sup_Inf
haftmann@25184
  1061
    Sup_bool_eq             ~> Sup_bool_def
haftmann@25184
  1062
    Sup_fun_eq              ~> Sup_fun_def
haftmann@25184
  1063
    Sup_set_eq              ~> Sup_set_def
haftmann@25184
  1064
haftmann@25184
  1065
    listsp_meetI            ~> listsp_infI
haftmann@25184
  1066
    listsp_meet_eq          ~> listsp_inf_eq
haftmann@25184
  1067
haftmann@25184
  1068
    meet_min                ~> inf_min
haftmann@25184
  1069
    join_max                ~> sup_max
haftmann@25184
  1070
haftmann@25184
  1071
* Added syntactic class "size"; overloaded constant "size" now has
haftmann@25184
  1072
type "'a::size ==> bool"
haftmann@25184
  1073
wenzelm@24800
  1074
* Internal reorganisation of `size' of datatypes: size theorems
wenzelm@24800
  1075
"foo.size" are no longer subsumed by "foo.simps" (but are still
wenzelm@24800
  1076
simplification rules by default!); theorems "prod.size" now named
haftmann@25184
  1077
"*.size".
haftmann@25184
  1078
haftmann@25184
  1079
* Class "div" now inherits from class "times" rather than "type".
haftmann@25184
  1080
INCOMPATIBILITY.
wenzelm@24800
  1081
wenzelm@24800
  1082
* HOL/Finite_Set: "name-space" locales Lattice, Distrib_lattice,
wenzelm@24800
  1083
Linorder etc.  have disappeared; operations defined in terms of
wenzelm@24800
  1084
fold_set now are named Inf_fin, Sup_fin.  INCOMPATIBILITY.
wenzelm@24800
  1085
wenzelm@25129
  1086
* HOL/Nat: neq0_conv no longer declared as iff.  INCOMPATIBILITY.
wenzelm@25129
  1087
wenzelm@24800
  1088
* HOL-Word: New extensive library and type for generic, fixed size
wenzelm@24800
  1089
machine words, with arithemtic, bit-wise, shifting and rotating
wenzelm@24800
  1090
operations, reflection into int, nat, and bool lists, automation for
wenzelm@24800
  1091
linear arithmetic (by automatic reflection into nat or int), including
wenzelm@24800
  1092
lemmas on overflow and monotonicity.  Instantiated to all appropriate
wenzelm@24800
  1093
arithmetic type classes, supporting automatic simplification of
wenzelm@24800
  1094
numerals on all operations.
kleing@24333
  1095
kleing@24333
  1096
* Library/Boolean_Algebra: locales for abstract boolean algebras.
kleing@24333
  1097
kleing@24333
  1098
* Library/Numeral_Type: numbers as types, e.g. TYPE(32).
kleing@24333
  1099
haftmann@23850
  1100
* Code generator library theories:
haftmann@24993
  1101
  - Code_Integer represents HOL integers by big integer literals in target
haftmann@23850
  1102
    languages.
haftmann@24993
  1103
  - Code_Char represents HOL characters by character literals in target
haftmann@23850
  1104
    languages.
haftmann@24993
  1105
  - Code_Char_chr like Code_Char, but also offers treatment of character
haftmann@24993
  1106
    codes; includes Code_Integer.
wenzelm@24800
  1107
  - Executable_Set allows to generate code for finite sets using lists.
wenzelm@24800
  1108
  - Executable_Rat implements rational numbers as triples (sign, enumerator,
haftmann@23850
  1109
    denominator).
wenzelm@24800
  1110
  - Executable_Real implements a subset of real numbers, namly those
haftmann@23850
  1111
    representable by rational numbers.
wenzelm@24800
  1112
  - Efficient_Nat implements natural numbers by integers, which in general will
haftmann@23850
  1113
    result in higher efficency; pattern matching with 0/Suc is eliminated;
haftmann@24993
  1114
    includes Code_Integer.
haftmann@24993
  1115
  - Code_Index provides an additional datatype index which is mapped to
haftmann@24993
  1116
    target-language built-in integers.
haftmann@26355
  1117
  - Code_Message provides an additional datatype message_string which is isomorphic to
haftmann@24993
  1118
    strings; messages are mapped to target-language strings.
haftmann@23850
  1119
berghofe@23783
  1120
* New package for inductive predicates
berghofe@23783
  1121
berghofe@23783
  1122
  An n-ary predicate p with m parameters z_1, ..., z_m can now be defined via
berghofe@23783
  1123
berghofe@23783
  1124
    inductive
berghofe@23783
  1125
      p :: "U_1 => ... => U_m => T_1 => ... => T_n => bool"
berghofe@23783
  1126
      for z_1 :: U_1 and ... and z_n :: U_m
berghofe@23783
  1127
    where
berghofe@23783
  1128
      rule_1: "... ==> p z_1 ... z_m t_1_1 ... t_1_n"
berghofe@23783
  1129
    | ...
berghofe@23783
  1130
wenzelm@24800
  1131
  with full support for type-inference, rather than
berghofe@23783
  1132
berghofe@23783
  1133
    consts s :: "U_1 => ... => U_m => (T_1 * ... * T_n) set"
berghofe@23783
  1134
berghofe@23783
  1135
    abbreviation p :: "U_1 => ... => U_m => T_1 => ... => T_n => bool"
berghofe@23783
  1136
    where "p z_1 ... z_m x_1 ... x_n == (x_1, ..., x_n) : s z_1 ... z_m"
berghofe@23783
  1137
berghofe@23783
  1138
    inductive "s z_1 ... z_m"
berghofe@23783
  1139
    intros
berghofe@23783
  1140
      rule_1: "... ==> (t_1_1, ..., t_1_n) : s z_1 ... z_m"
berghofe@23783
  1141
      ...
berghofe@23783
  1142
berghofe@23783
  1143
  For backward compatibility, there is a wrapper allowing inductive
berghofe@23783
  1144
  sets to be defined with the new package via
berghofe@23783
  1145
berghofe@23783
  1146
    inductive_set
berghofe@23783
  1147
      s :: "U_1 => ... => U_m => (T_1 * ... * T_n) set"
berghofe@23783
  1148
      for z_1 :: U_1 and ... and z_n :: U_m
berghofe@23783
  1149
    where
berghofe@23783
  1150
      rule_1: "... ==> (t_1_1, ..., t_1_n) : s z_1 ... z_m"
berghofe@23783
  1151
    | ...
berghofe@23783
  1152
berghofe@23783
  1153
  or
berghofe@23783
  1154
berghofe@23783
  1155
    inductive_set
berghofe@23783
  1156
      s :: "U_1 => ... => U_m => (T_1 * ... * T_n) set"
berghofe@23783
  1157
      and p :: "U_1 => ... => U_m => T_1 => ... => T_n => bool"
berghofe@23783
  1158
      for z_1 :: U_1 and ... and z_n :: U_m
berghofe@23783
  1159
    where
berghofe@23783
  1160
      "p z_1 ... z_m x_1 ... x_n == (x_1, ..., x_n) : s z_1 ... z_m"
berghofe@23783
  1161
    | rule_1: "... ==> p z_1 ... z_m t_1_1 ... t_1_n"
berghofe@23783
  1162
    | ...
berghofe@23783
  1163
berghofe@23783
  1164
  if the additional syntax "p ..." is required.
berghofe@23783
  1165
wenzelm@25177
  1166
  Numerous examples can be found in the subdirectories src/HOL/Auth,
wenzelm@25177
  1167
  src/HOL/Bali, src/HOL/Induct, and src/HOL/MicroJava.
berghofe@23783
  1168
berghofe@23783
  1169
  INCOMPATIBILITIES:
berghofe@23783
  1170
berghofe@23783
  1171
  - Since declaration and definition of inductive sets or predicates
wenzelm@24800
  1172
    is no longer separated, abbreviations involving the newly
wenzelm@24800
  1173
    introduced sets or predicates must be specified together with the
wenzelm@24800
  1174
    introduction rules after the 'where' keyword (see above), rather
wenzelm@24800
  1175
    than before the actual inductive definition.
wenzelm@24800
  1176
wenzelm@24800
  1177
  - The variables in induction and elimination rules are now
wenzelm@24800
  1178
    quantified in the order of their occurrence in the introduction
wenzelm@24800
  1179
    rules, rather than in alphabetical order. Since this may break
wenzelm@24800
  1180
    some proofs, these proofs either have to be repaired, e.g. by
wenzelm@24800
  1181
    reordering the variables a_i_1 ... a_i_{k_i} in Isar 'case'
wenzelm@24800
  1182
    statements of the form
berghofe@23783
  1183
berghofe@23783
  1184
      case (rule_i a_i_1 ... a_i_{k_i})
berghofe@23783
  1185
berghofe@23783
  1186
    or the old order of quantification has to be restored by explicitly adding
berghofe@23783
  1187
    meta-level quantifiers in the introduction rules, i.e.
berghofe@23783
  1188
berghofe@23783
  1189
      | rule_i: "!!a_i_1 ... a_i_{k_i}. ... ==> p z_1 ... z_m t_i_1 ... t_i_n"
berghofe@23783
  1190
berghofe@23783
  1191
  - The format of the elimination rules is now
berghofe@23783
  1192
berghofe@23783
  1193
      p z_1 ... z_m x_1 ... x_n ==>
berghofe@23783
  1194
        (!!a_1_1 ... a_1_{k_1}. x_1 = t_1_1 ==> ... ==> x_n = t_1_n ==> ... ==> P)
berghofe@23783
  1195
        ==> ... ==> P
berghofe@23783
  1196
berghofe@23783
  1197
    for predicates and
berghofe@23783
  1198
berghofe@23783
  1199
      (x_1, ..., x_n) : s z_1 ... z_m ==>
berghofe@23783
  1200
        (!!a_1_1 ... a_1_{k_1}. x_1 = t_1_1 ==> ... ==> x_n = t_1_n ==> ... ==> P)
berghofe@23783
  1201
        ==> ... ==> P
berghofe@23783
  1202
berghofe@23783
  1203
    for sets rather than
berghofe@23783
  1204
berghofe@23783
  1205
      x : s z_1 ... z_m ==>
berghofe@23783
  1206
        (!!a_1_1 ... a_1_{k_1}. x = (t_1_1, ..., t_1_n) ==> ... ==> P)
berghofe@23783
  1207
        ==> ... ==> P
berghofe@23783
  1208
wenzelm@24800
  1209
    This may require terms in goals to be expanded to n-tuples
wenzelm@24800
  1210
    (e.g. using case_tac or simplification with the split_paired_all
wenzelm@24800
  1211
    rule) before the above elimination rule is applicable.
wenzelm@24800
  1212
wenzelm@24800
  1213
  - The elimination or case analysis rules for (mutually) inductive
wenzelm@24800
  1214
    sets or predicates are now called "p_1.cases" ... "p_k.cases". The
wenzelm@24800
  1215
    list of rules "p_1_..._p_k.elims" is no longer available.
berghofe@23783
  1216
krauss@25198
  1217
* New package "function"/"fun" for general recursive functions,
krauss@25198
  1218
supporting mutual and nested recursion, definitions in local contexts,
krauss@25198
  1219
more general pattern matching and partiality. See HOL/ex/Fundefs.thy
krauss@25198
  1220
for small examples, and the separate tutorial on the function
krauss@25198
  1221
package. The old recdef "package" is still available as before, but
krauss@25198
  1222
users are encouraged to use the new package.
krauss@25198
  1223
krauss@25198
  1224
* Method "lexicographic_order" automatically synthesizes termination
krauss@25198
  1225
relations as lexicographic combinations of size measures. 
krauss@25198
  1226
wenzelm@24800
  1227
* Case-expressions allow arbitrary constructor-patterns (including
wenzelm@24800
  1228
"_") and take their order into account, like in functional
wenzelm@24800
  1229
programming.  Internally, this is translated into nested
wenzelm@24800
  1230
case-expressions; missing cases are added and mapped to the predefined
wenzelm@24800
  1231
constant "undefined". In complicated cases printing may no longer show
wenzelm@24800
  1232
the original input but the internal form. Lambda-abstractions allow
wenzelm@24800
  1233
the same form of pattern matching: "% pat1 => e1 | ..." is an
wenzelm@24800
  1234
abbreviation for "%x. case x of pat1 => e1 | ..." where x is a new
wenzelm@24800
  1235
variable.
nipkow@23564
  1236
huffman@23468
  1237
* IntDef: The constant "int :: nat => int" has been removed; now "int"
wenzelm@24800
  1238
is an abbreviation for "of_nat :: nat => int". The simplification
wenzelm@24800
  1239
rules for "of_nat" have been changed to work like "int" did
wenzelm@24800
  1240
previously.  Potential INCOMPATIBILITY:
huffman@23468
  1241
  - "of_nat (Suc m)" simplifies to "1 + of_nat m" instead of "of_nat m + 1"
huffman@23468
  1242
  - of_nat_diff and of_nat_mult are no longer default simp rules
huffman@23377
  1243
chaieb@23295
  1244
* Method "algebra" solves polynomial equations over (semi)rings using
wenzelm@24800
  1245
Groebner bases. The (semi)ring structure is defined by locales and the
wenzelm@24800
  1246
tool setup depends on that generic context. Installing the method for
wenzelm@24800
  1247
a specific type involves instantiating the locale and possibly adding
wenzelm@24800
  1248
declarations for computation on the coefficients.  The method is
wenzelm@24800
  1249
already instantiated for natural numbers and for the axiomatic class
wenzelm@24800
  1250
of idoms with numerals.  See also the paper by Chaieb and Wenzel at
wenzelm@24800
  1251
CALCULEMUS 2007 for the general principles underlying this
wenzelm@24800
  1252
architecture of context-aware proof-tools.
wenzelm@24800
  1253
wenzelm@25033
  1254
* Method "ferrack" implements quantifier elimination over
wenzelm@25033
  1255
special-purpose dense linear orders using locales (analogous to
wenzelm@25033
  1256
"algebra"). The method is already installed for class
wenzelm@25033
  1257
{ordered_field,recpower,number_ring} which subsumes real, hyperreal,
wenzelm@25033
  1258
rat, etc.
wenzelm@25033
  1259
wenzelm@24800
  1260
* Former constant "List.op @" now named "List.append".  Use ML
wenzelm@24800
  1261
antiquotations @{const_name List.append} or @{term " ... @ ... "} to
wenzelm@24800
  1262
circumvent possible incompatibilities when working on ML level.
wenzelm@24800
  1263
haftmann@24996
  1264
* primrec: missing cases mapped to "undefined" instead of "arbitrary".
haftmann@22845
  1265
wenzelm@24800
  1266
* New function listsum :: 'a list => 'a for arbitrary monoids.
wenzelm@24800
  1267
Special syntax: "SUM x <- xs. f x" (and latex variants)
wenzelm@24800
  1268
wenzelm@24800
  1269
* New syntax for Haskell-like list comprehension (input only), eg.
wenzelm@25177
  1270
[(x,y). x <- xs, y <- ys, x ~= y], see also src/HOL/List.thy.
wenzelm@24800
  1271
wenzelm@24800
  1272
* The special syntax for function "filter" has changed from [x :
wenzelm@24800
  1273
xs. P] to [x <- xs. P] to avoid an ambiguity caused by list
wenzelm@24800
  1274
comprehension syntax, and for uniformity.  INCOMPATIBILITY.
wenzelm@24800
  1275
wenzelm@24800
  1276
* [a..b] is now defined for arbitrary linear orders.  It used to be
wenzelm@24800
  1277
defined on nat only, as an abbreviation for [a..<Suc b]
wenzelm@24800
  1278
INCOMPATIBILITY.
wenzelm@24800
  1279
wenzelm@24800
  1280
* Renamed lemma "set_take_whileD"  to "set_takeWhileD".
wenzelm@24800
  1281
wenzelm@25177
  1282
* New functions "sorted" and "sort" in src/HOL/List.thy.
wenzelm@24800
  1283
wenzelm@24800
  1284
* New lemma collection field_simps (an extension of ring_simps) for
wenzelm@24800
  1285
manipulating (in)equations involving division. Multiplies with all
wenzelm@24800
  1286
denominators that can be proved to be non-zero (in equations) or
wenzelm@24800
  1287
positive/negative (in inequations).
nipkow@23480
  1288
nipkow@23480
  1289
* Lemma collections ring_eq_simps, group_eq_simps and ring_distrib
wenzelm@24800
  1290
have been improved and renamed to ring_simps, group_simps and
wenzelm@24800
  1291
ring_distribs.  Removed lemmas field_xyz in theory Ring_and_Field
wenzelm@24800
  1292
because they were subsumed by lemmas xyz.  INCOMPATIBILITY.
wenzelm@24800
  1293
wenzelm@25177
  1294
* Theory Library/Commutative_Ring: switched from recdef to function
wenzelm@24800
  1295
package; constants add, mul, pow now curried.  Infix syntax for
wenzelm@24800
  1296
algebraic operations.
haftmann@22735
  1297
wenzelm@24800
  1298
* Dropped redundant lemma def_imp_eq in favor of meta_eq_to_obj_eq.
haftmann@22218
  1299
INCOMPATIBILITY.
haftmann@22218
  1300
wenzelm@24800
  1301
* Dropped redundant lemma if_def2 in favor of if_bool_eq_conj.
haftmann@22218
  1302
INCOMPATIBILITY.
haftmann@22218
  1303
wenzelm@22126
  1304
* HOL/records: generalised field-update to take a function on the
wenzelm@22126
  1305
field rather than the new value: r(|A := x|) is translated to A_update
wenzelm@22126
  1306
(K x) r The K-combinator that is internally used is called K_record.
schirmer@21226
  1307
INCOMPATIBILITY: Usage of the plain update functions has to be
schirmer@21226
  1308
adapted.
schirmer@21226
  1309
 
wenzelm@24800
  1310
* Class "semiring_0" now contains annihilation axioms x * 0 = 0 and 0
wenzelm@24800
  1311
* x = 0, which are required for a semiring.  Richer structures do not
wenzelm@24800
  1312
inherit from semiring_0 anymore, because this property is a theorem
wenzelm@24800
  1313
there, not an axiom.  INCOMPATIBILITY: In instances of semiring_0,
wenzelm@24800
  1314
there is more to prove, but this is mostly trivial.
wenzelm@24800
  1315
wenzelm@24800
  1316
* Class "recpower" is generalized to arbitrary monoids, not just
wenzelm@24800
  1317
commutative semirings.  INCOMPATIBILITY: may need to incorporate
haftmann@25163
  1318
commutativity or semiring properties additionally.
haftmann@21215
  1319
haftmann@21099
  1320
* Constant "List.list_all2" in List.thy now uses authentic syntax.
wenzelm@24800
  1321
INCOMPATIBILITY: translations containing list_all2 may go wrong,
wenzelm@24800
  1322
better use 'abbreviation'.
wenzelm@24800
  1323
wenzelm@24800
  1324
* Renamed constant "List.op mem" to "List.member".  INCOMPATIBILITY.
wenzelm@24800
  1325
wenzelm@22126
  1326
* Numeral syntax: type 'bin' which was a mere type copy of 'int' has
wenzelm@24800
  1327
been abandoned in favour of plain 'int'.  INCOMPATIBILITY --
wenzelm@22126
  1328
significant changes for setting up numeral syntax for types:
wenzelm@24800
  1329
  - New constants Numeral.pred and Numeral.succ instead
haftmann@20485
  1330
      of former Numeral.bin_pred and Numeral.bin_succ.
haftmann@20485
  1331
  - Use integer operations instead of bin_add, bin_mult and so on.
haftmann@20485
  1332
  - Numeral simplification theorems named Numeral.numeral_simps instead of Bin_simps.
haftmann@20485
  1333
  - ML structure Bin_Simprocs now named Int_Numeral_Base_Simprocs.
haftmann@20485
  1334
wenzelm@25177
  1335
See src/HOL/Integ/IntArith.thy for an example setup.
wenzelm@25177
  1336
wenzelm@25177
  1337
* Command 'normal_form' computes the normal form of a term that may
wenzelm@25177
  1338
contain free variables.  For example ``normal_form "rev [a, b, c]"''
wenzelm@25177
  1339
produces ``[b, c, a]'' (without proof).  This command is suitable for
wenzelm@25177
  1340
heavy-duty computations because the functions are compiled to ML
wenzelm@25177
  1341
first.  Correspondingly, a method "normalization" is provided.  See
wenzelm@25177
  1342
further src/HOL/ex/NormalForm.thy and src/Tools/nbe.ML.
nipkow@19895
  1343
wenzelm@17996
  1344
* Alternative iff syntax "A <-> B" for equality on bool (with priority
wenzelm@17996
  1345
25 like -->); output depends on the "iff" print_mode, the default is
wenzelm@17996
  1346
"A = B" (with priority 50).
wenzelm@17996
  1347
wenzelm@21265
  1348
* Relations less (<) and less_eq (<=) are also available on type bool.
wenzelm@21265
  1349
Modified syntax to disallow nesting without explicit parentheses,
wenzelm@24800
  1350
e.g. "(x < y) < z" or "x < (y < z)", but NOT "x < y < z".  Potential
wenzelm@24800
  1351
INCOMPATIBILITY.
wenzelm@21265
  1352
nipkow@18674
  1353
* "LEAST x:A. P" expands to "LEAST x. x:A & P" (input only).
nipkow@18674
  1354
krauss@20716
  1355
* Relation composition operator "op O" now has precedence 75 and binds
krauss@20716
  1356
stronger than union and intersection. INCOMPATIBILITY.
krauss@20716
  1357
wenzelm@22126
  1358
* The old set interval syntax "{m..n(}" (and relatives) has been
wenzelm@22126
  1359
removed.  Use "{m..<n}" (and relatives) instead.
nipkow@19377
  1360
wenzelm@17865
  1361
* In the context of the assumption "~(s = t)" the Simplifier rewrites
wenzelm@24800
  1362
"t = s" to False (by simproc "neq").  INCOMPATIBILITY, consider using
wenzelm@24800
  1363
``declare [[simproc del: neq]]''.
wenzelm@24800
  1364
wenzelm@24800
  1365
* Simplifier: "m dvd n" where m and n are numbers is evaluated to
wenzelm@24800
  1366
True/False.
wenzelm@24800
  1367
wenzelm@24800
  1368
* Theorem Cons_eq_map_conv no longer declared as "simp".
nipkow@19211
  1369
ballarin@19279
  1370
* Theorem setsum_mult renamed to setsum_right_distrib.
ballarin@19279
  1371
nipkow@19211
  1372
* Prefer ex1I over ex_ex1I in single-step reasoning, e.g. by the
wenzelm@22126
  1373
``rule'' method.
wenzelm@22126
  1374
wenzelm@24800
  1375
* Reimplemented methods "sat" and "satx", with several improvements:
wenzelm@24800
  1376
goals no longer need to be stated as "<prems> ==> False", equivalences
wenzelm@24800
  1377
(i.e. "=" on type bool) are handled, variable names of the form
wenzelm@24800
  1378
"lit_<n>" are no longer reserved, significant speedup.
wenzelm@24800
  1379
wenzelm@24800
  1380
* Methods "sat" and "satx" can now replay MiniSat proof traces.
wenzelm@22126
  1381
zChaff is still supported as well.
wenzelm@22126
  1382
wenzelm@22126
  1383
* 'inductive' and 'datatype': provide projections of mutual rules,
wenzelm@22126
  1384
bundled as foo_bar.inducts;
wenzelm@22126
  1385
wenzelm@22126
  1386
* Library: moved theories Parity, GCD, Binomial, Infinite_Set to
wenzelm@22126
  1387
Library.
wenzelm@21256
  1388
wenzelm@21256
  1389
* Library: moved theory Accessible_Part to main HOL.
wenzelm@19572
  1390
wenzelm@18446
  1391
* Library: added theory Coinductive_List of potentially infinite lists
wenzelm@18446
  1392
as greatest fixed-point.
wenzelm@18399
  1393
wenzelm@19254
  1394
* Library: added theory AssocList which implements (finite) maps as
schirmer@19252
  1395
association lists.
webertj@17809
  1396
wenzelm@24800
  1397
* Method "evaluation" solves goals (i.e. a boolean expression)
wenzelm@24800
  1398
efficiently by compiling it to ML.  The goal is "proved" (via an
wenzelm@24800
  1399
oracle) if it evaluates to True.
wenzelm@20807
  1400
wenzelm@20807
  1401
* Linear arithmetic now splits certain operators (e.g. min, max, abs)
wenzelm@24800
  1402
also when invoked by the simplifier.  This results in the Simplifier
wenzelm@24800
  1403
being more powerful on arithmetic goals.  INCOMPATIBILITY.
wenzelm@24800
  1404
Configuration option fast_arith_split_limit=0 recovers the old
wenzelm@24800
  1405
behavior.
webertj@20217
  1406
wenzelm@22126
  1407
* Support for hex (0x20) and binary (0b1001) numerals.
wenzelm@19254
  1408
wenzelm@20807
  1409
* New method: reify eqs (t), where eqs are equations for an
wenzelm@20807
  1410
interpretation I :: 'a list => 'b => 'c and t::'c is an optional
wenzelm@20807
  1411
parameter, computes a term s::'b and a list xs::'a list and proves the
wenzelm@20807
  1412
theorem I xs s = t. This is also known as reification or quoting. The
wenzelm@20807
  1413
resulting theorem is applied to the subgoal to substitute t with I xs
wenzelm@20807
  1414
s.  If t is omitted, the subgoal itself is reified.
wenzelm@20807
  1415
wenzelm@20807
  1416
* New method: reflection corr_thm eqs (t). The parameters eqs and (t)
wenzelm@20807
  1417
are as explained above. corr_thm is a theorem for I vs (f t) = I vs t,
wenzelm@20807
  1418
where f is supposed to be a computable function (in the sense of code
wenzelm@20807
  1419
generattion). The method uses reify to compute s and xs as above then
wenzelm@20807
  1420
applies corr_thm and uses normalization by evaluation to "prove" f s =
wenzelm@20807
  1421
r and finally gets the theorem t = r, which is again applied to the
wenzelm@25177
  1422
subgoal. An Example is available in src/HOL/ex/ReflectionEx.thy.
wenzelm@25177
  1423
wenzelm@25177
  1424
* Reflection: Automatic reification now handels binding, an example is
wenzelm@25177
  1425
available in src/HOL/ex/ReflectionEx.thy
wenzelm@20807
  1426
wenzelm@25397
  1427
* HOL-Statespace: ``State Spaces: The Locale Way'' introduces a
schirmer@25409
  1428
command 'statespace' that is similar to 'record', but introduces an
wenzelm@25397
  1429
abstract specification based on the locale infrastructure instead of
wenzelm@25397
  1430
HOL types.  This leads to extra flexibility in composing state spaces,
wenzelm@25397
  1431
in particular multiple inheritance and renaming of components.
wenzelm@25397
  1432
wenzelm@25397
  1433
wenzelm@19653
  1434
*** HOL-Complex ***
wenzelm@19653
  1435
huffman@22971
  1436
* Hyperreal: Functions root and sqrt are now defined on negative real
huffman@22971
  1437
inputs so that root n (- x) = - root n x and sqrt (- x) = - sqrt x.
huffman@22971
  1438
Nonnegativity side conditions have been removed from many lemmas, so
huffman@22971
  1439
that more subgoals may now be solved by simplification; potential
huffman@22971
  1440
INCOMPATIBILITY.
huffman@22971
  1441
wenzelm@24800
  1442
* Real: new type classes formalize real normed vector spaces and
huffman@21791
  1443
algebras, using new overloaded constants scaleR :: real => 'a => 'a
huffman@21791
  1444
and norm :: 'a => real.
huffman@21791
  1445
wenzelm@24800
  1446
* Real: constant of_real :: real => 'a::real_algebra_1 injects from
wenzelm@24800
  1447
reals into other types. The overloaded constant Reals :: 'a set is now
wenzelm@24800
  1448
defined as range of_real; potential INCOMPATIBILITY.
wenzelm@24800
  1449
wenzelm@24800
  1450
* Real: proper support for ML code generation, including 'quickcheck'.
nipkow@23013
  1451
Reals are implemented as arbitrary precision rationals.
nipkow@23013
  1452
wenzelm@22126
  1453
* Hyperreal: Several constants that previously worked only for the
wenzelm@22126
  1454
reals have been generalized, so they now work over arbitrary vector
wenzelm@22126
  1455
spaces. Type annotations may need to be added in some cases; potential
wenzelm@22126
  1456
INCOMPATIBILITY.
huffman@21791
  1457
huffman@22972
  1458
  Infinitesimal  :: ('a::real_normed_vector) star set
huffman@22972
  1459
  HFinite        :: ('a::real_normed_vector) star set
huffman@22972
  1460
  HInfinite      :: ('a::real_normed_vector) star set
huffman@21791
  1461
  approx         :: ('a::real_normed_vector) star => 'a star => bool
huffman@21791
  1462
  monad          :: ('a::real_normed_vector) star => 'a star set
huffman@21791
  1463
  galaxy         :: ('a::real_normed_vector) star => 'a star set
huffman@22972
  1464
  (NS)LIMSEQ     :: [nat => 'a::real_normed_vector, 'a] => bool
huffman@21791
  1465
  (NS)convergent :: (nat => 'a::real_normed_vector) => bool
huffman@21791
  1466
  (NS)Bseq       :: (nat => 'a::real_normed_vector) => bool
huffman@21791
  1467
  (NS)Cauchy     :: (nat => 'a::real_normed_vector) => bool
huffman@21791
  1468
  (NS)LIM        :: ['a::real_normed_vector => 'b::real_normed_vector, 'a, 'b] => bool
huffman@21791
  1469
  is(NS)Cont     :: ['a::real_normed_vector => 'b::real_normed_vector, 'a] => bool
huffman@21791
  1470
  deriv          :: ['a::real_normed_field => 'a, 'a, 'a] => bool
huffman@22972
  1471
  sgn            :: 'a::real_normed_vector => 'a
huffman@23116
  1472
  exp            :: 'a::{recpower,real_normed_field,banach} => 'a
huffman@21791
  1473
huffman@21791
  1474
* Complex: Some complex-specific constants are now abbreviations for
wenzelm@22126
  1475
overloaded ones: complex_of_real = of_real, cmod = norm, hcmod =
wenzelm@22126
  1476
hnorm.  Other constants have been entirely removed in favor of the
wenzelm@22126
  1477
polymorphic versions (INCOMPATIBILITY):
huffman@21791
  1478
huffman@21791
  1479
  approx        <-- capprox
huffman@21791
  1480
  HFinite       <-- CFinite
huffman@21791
  1481
  HInfinite     <-- CInfinite
huffman@21791
  1482
  Infinitesimal <-- CInfinitesimal
huffman@21791
  1483
  monad         <-- cmonad
huffman@21791
  1484
  galaxy        <-- cgalaxy
huffman@21791
  1485
  (NS)LIM       <-- (NS)CLIM, (NS)CRLIM
huffman@21791
  1486
  is(NS)Cont    <-- is(NS)Contc, is(NS)contCR
huffman@21791
  1487
  (ns)deriv     <-- (ns)cderiv
huffman@21791
  1488
wenzelm@19653
  1489
wenzelm@24801
  1490
*** HOL-Algebra ***
wenzelm@24801
  1491
wenzelm@24801
  1492
* Formalisation of ideals and the quotient construction over rings.
wenzelm@24801
  1493
wenzelm@24801
  1494
* Order and lattice theory no longer based on records.
wenzelm@24801
  1495
INCOMPATIBILITY.
wenzelm@24801
  1496
wenzelm@24801
  1497
* Renamed lemmas least_carrier -> least_closed and greatest_carrier ->
wenzelm@24801
  1498
greatest_closed.  INCOMPATIBILITY.
wenzelm@24801
  1499
wenzelm@24801
  1500
* Method algebra is now set up via an attribute.  For examples see
wenzelm@24801
  1501
Ring.thy.  INCOMPATIBILITY: the method is now weaker on combinations
wenzelm@24801
  1502
of algebraic structures.
wenzelm@24801
  1503
wenzelm@24801
  1504
* Renamed theory CRing to Ring.
wenzelm@24801
  1505
wenzelm@24801
  1506
wenzelm@24801
  1507
*** HOL-Nominal ***
wenzelm@24801
  1508
wenzelm@25148
  1509
* Substantial, yet incomplete support for nominal datatypes (binding
wenzelm@25177
  1510
structures) based on HOL-Nominal logic.  See src/HOL/Nominal and
wenzelm@25177
  1511
src/HOL/Nominal/Examples.  Prospective users should consult
wenzelm@25148
  1512
http://isabelle.in.tum.de/nominal/
wenzelm@25148
  1513
wenzelm@24801
  1514
wenzelm@17878
  1515
*** ML ***
wenzelm@17878
  1516
wenzelm@24643
  1517
* ML basics: just one true type int, which coincides with IntInf.int
wenzelm@24643
  1518
(even on SML/NJ).
wenzelm@24643
  1519
wenzelm@22138
  1520
* ML within Isar: antiquotations allow to embed statically-checked
wenzelm@22138
  1521
formal entities in the source, referring to the context available at
wenzelm@22138
  1522
compile-time.  For example:
wenzelm@22138
  1523
wenzelm@25142
  1524
ML {* @{sort "{zero,one}"} *}
wenzelm@22138
  1525
ML {* @{typ "'a => 'b"} *}
wenzelm@22138
  1526
ML {* @{term "%x. x"} *}
wenzelm@22138
  1527
ML {* @{prop "x == y"} *}
wenzelm@22138
  1528
ML {* @{ctyp "'a => 'b"} *}
wenzelm@22138
  1529
ML {* @{cterm "%x. x"} *}
wenzelm@22138
  1530
ML {* @{cprop "x == y"} *}
wenzelm@22138
  1531
ML {* @{thm asm_rl} *}
wenzelm@22138
  1532
ML {* @{thms asm_rl} *}
wenzelm@24692
  1533
ML {* @{type_name c} *}
wenzelm@25142
  1534
ML {* @{type_syntax c} *}
wenzelm@22376
  1535
ML {* @{const_name c} *}
wenzelm@22376
  1536
ML {* @{const_syntax c} *}
wenzelm@22138
  1537
ML {* @{context} *}
wenzelm@22138
  1538
ML {* @{theory} *}
wenzelm@22138
  1539
ML {* @{theory Pure} *}
wenzelm@24692
  1540
ML {* @{theory_ref} *}
wenzelm@24692
  1541
ML {* @{theory_ref Pure} *}
wenzelm@22138
  1542
ML {* @{simpset} *}
wenzelm@22138
  1543
ML {* @{claset} *}
wenzelm@22138
  1544
ML {* @{clasimpset} *}
wenzelm@22138
  1545
wenzelm@22151
  1546
The same works for sources being ``used'' within an Isar context.
wenzelm@22151
  1547
wenzelm@22152
  1548
* ML in Isar: improved error reporting; extra verbosity with
wenzelm@24706
  1549
ML_Context.trace enabled.
wenzelm@22152
  1550
wenzelm@19032
  1551
* Pure/General/table.ML: the join operations now works via exceptions
wenzelm@24706
  1552
DUP/SAME instead of type option. This is simpler in simple cases, and
wenzelm@19081
  1553
admits slightly more efficient complex applications.
wenzelm@18446
  1554
wenzelm@24800
  1555
* Pure: 'advanced' translation functions (parse_translation etc.) now
wenzelm@24800
  1556
use Context.generic instead of just theory.
wenzelm@24800
  1557
wenzelm@18642
  1558
* Pure: datatype Context.generic joins theory/Proof.context and
wenzelm@18644
  1559
provides some facilities for code that works in either kind of
wenzelm@18642
  1560
context, notably GenericDataFun for uniform theory and proof data.
wenzelm@18642
  1561
wenzelm@18737
  1562
* Pure: simplified internal attribute type, which is now always
wenzelm@24706
  1563
Context.generic * thm -> Context.generic * thm. Global (theory) vs.
wenzelm@24706
  1564
local (Proof.context) attributes have been discontinued, while
wenzelm@24706
  1565
minimizing code duplication. Thm.rule_attribute and
wenzelm@24706
  1566
Thm.declaration_attribute build canonical attributes; see also structure
wenzelm@24706
  1567
Context for further operations on Context.generic, notably
wenzelm@24706
  1568
GenericDataFun. INCOMPATIBILITY, need to adapt attribute type
wenzelm@19006
  1569
declarations and definitions.
wenzelm@19006
  1570
wenzelm@24800
  1571
* Context data interfaces (Theory/Proof/GenericDataFun): removed
wenzelm@24800
  1572
name/print, uninitialized data defaults to ad-hoc copy of empty value,
wenzelm@24800
  1573
init only required for impure data. INCOMPATIBILITY: empty really need
wenzelm@24800
  1574
to be empty (no dependencies on theory content!)
wenzelm@24800
  1575
wenzelm@19508
  1576
* Pure/kernel: consts certification ignores sort constraints given in
wenzelm@24800
  1577
signature declarations. (This information is not relevant to the
wenzelm@24800
  1578
logic, but only for type inference.) SIGNIFICANT INTERNAL CHANGE,
wenzelm@24800
  1579
potential INCOMPATIBILITY.
wenzelm@19508
  1580
wenzelm@19508
  1581
* Pure: axiomatic type classes are now purely definitional, with
wenzelm@19508
  1582
explicit proofs of class axioms and super class relations performed
wenzelm@24706
  1583
internally. See Pure/axclass.ML for the main internal interfaces --
wenzelm@19508
  1584
notably AxClass.define_class supercedes AxClass.add_axclass, and
wenzelm@24706
  1585
AxClass.axiomatize_class/classrel/arity supersede
wenzelm@19508
  1586
Sign.add_classes/classrel/arities.
wenzelm@19508
  1587
wenzelm@19006
  1588
* Pure/Isar: Args/Attrib parsers operate on Context.generic --
wenzelm@19006
  1589
global/local versions on theory vs. Proof.context have been
wenzelm@19006
  1590
discontinued; Attrib.syntax and Method.syntax have been adapted
wenzelm@19006
  1591
accordingly.  INCOMPATIBILITY, need to adapt parser expressions for
wenzelm@19006
  1592
attributes, methods, etc.
wenzelm@18642
  1593
wenzelm@18446
  1594
* Pure: several functions of signature "... -> theory -> theory * ..."
wenzelm@18446
  1595
have been reoriented to "... -> theory -> ... * theory" in order to
wenzelm@18446
  1596
allow natural usage in combination with the ||>, ||>>, |-> and
wenzelm@18446
  1597
fold_map combinators.
haftmann@18051
  1598
wenzelm@21647
  1599
* Pure: official theorem names (closed derivations) and additional
wenzelm@21647
  1600
comments (tags) are now strictly separate.  Name hints -- which are
wenzelm@21647
  1601
maintained as tags -- may be attached any time without affecting the
wenzelm@21647
  1602
derivation.
wenzelm@21647
  1603
wenzelm@18020
  1604
* Pure: primitive rule lift_rule now takes goal cterm instead of an
wenzelm@18145
  1605
actual goal state (thm).  Use Thm.lift_rule (Thm.cprem_of st i) to
wenzelm@18020
  1606
achieve the old behaviour.
wenzelm@18020
  1607
wenzelm@18020
  1608
* Pure: the "Goal" constant is now called "prop", supporting a
wenzelm@18020
  1609
slightly more general idea of ``protecting'' meta-level rule
wenzelm@18020
  1610
statements.
wenzelm@18020
  1611
wenzelm@20040
  1612
* Pure: Logic.(un)varify only works in a global context, which is now
wenzelm@20040
  1613
enforced instead of silently assumed.  INCOMPATIBILITY, may use
wenzelm@20040
  1614
Logic.legacy_(un)varify as temporary workaround.
wenzelm@20040
  1615
wenzelm@20090
  1616
* Pure: structure Name provides scalable operations for generating
wenzelm@20090
  1617
internal variable names, notably Name.variants etc.  This replaces
wenzelm@20090
  1618
some popular functions from term.ML:
wenzelm@20090
  1619
wenzelm@20090
  1620
  Term.variant		->  Name.variant
wenzelm@24800
  1621
  Term.variantlist	->  Name.variant_list
wenzelm@20090
  1622
  Term.invent_names	->  Name.invent_list
wenzelm@20090
  1623
wenzelm@20090
  1624
Note that low-level renaming rarely occurs in new code -- operations
wenzelm@20090
  1625
from structure Variable are used instead (see below).
wenzelm@20090
  1626
wenzelm@20040
  1627
* Pure: structure Variable provides fundamental operations for proper
wenzelm@20040
  1628
treatment of fixed/schematic variables in a context.  For example,
wenzelm@20040
  1629
Variable.import introduces fixes for schematics of given facts and
wenzelm@20040
  1630
Variable.export reverses the effect (up to renaming) -- this replaces
wenzelm@20040
  1631
various freeze_thaw operations.
wenzelm@20040
  1632
wenzelm@18567
  1633
* Pure: structure Goal provides simple interfaces for
wenzelm@17981
  1634
init/conclude/finish and tactical prove operations (replacing former
wenzelm@20040
  1635
Tactic.prove).  Goal.prove is the canonical way to prove results
wenzelm@20040
  1636
within a given context; Goal.prove_global is a degraded version for
wenzelm@20040
  1637
theory level goals, including a global Drule.standard.  Note that
wenzelm@20040
  1638
OldGoals.prove_goalw_cterm has long been obsolete, since it is
wenzelm@20040
  1639
ill-behaved in a local proof context (e.g. with local fixes/assumes or
wenzelm@20040
  1640
in a locale context).
wenzelm@17981
  1641
wenzelm@24706
  1642
* Pure/Syntax: generic interfaces for parsing (Syntax.parse_term etc.)
wenzelm@24706
  1643
and type checking (Syntax.check_term etc.), with common combinations
wenzelm@24706
  1644
(Syntax.read_term etc.). These supersede former Sign.read_term etc.
wenzelm@24706
  1645
which are considered legacy and await removal.
wenzelm@24706
  1646
wenzelm@24920
  1647
* Pure/Syntax: generic interfaces for type unchecking
wenzelm@24920
  1648
(Syntax.uncheck_terms etc.) and unparsing (Syntax.unparse_term etc.),
wenzelm@24920
  1649
with common combinations (Syntax.pretty_term, Syntax.string_of_term
wenzelm@24920
  1650
etc.).  Former Sign.pretty_term, Sign.string_of_term etc. are still
wenzelm@24924
  1651
available for convenience, but refer to the very same operations using
wenzelm@24924
  1652
a mere theory instead of a full context.
wenzelm@24920
  1653
wenzelm@18815
  1654
* Isar: simplified treatment of user-level errors, using exception
wenzelm@18687
  1655
ERROR of string uniformly.  Function error now merely raises ERROR,
wenzelm@18686
  1656
without any side effect on output channels.  The Isar toplevel takes
wenzelm@18686
  1657
care of proper display of ERROR exceptions.  ML code may use plain
wenzelm@18686
  1658
handle/can/try; cat_error may be used to concatenate errors like this:
wenzelm@18686
  1659
wenzelm@18686
  1660
  ... handle ERROR msg => cat_error msg "..."
wenzelm@18686
  1661
wenzelm@18686
  1662
Toplevel ML code (run directly or through the Isar toplevel) may be
wenzelm@18687
  1663
embedded into the Isar toplevel with exception display/debug like
wenzelm@18687
  1664
this:
wenzelm@18686
  1665
wenzelm@18686
  1666
  Isar.toplevel (fn () => ...)
wenzelm@18686
  1667
wenzelm@18686
  1668
INCOMPATIBILITY, removed special transform_error facilities, removed
wenzelm@18686
  1669
obsolete variants of user-level exceptions (ERROR_MESSAGE,
wenzelm@18686
  1670
Context.PROOF, ProofContext.CONTEXT, Proof.STATE, ProofHistory.FAIL)
wenzelm@18686
  1671
-- use plain ERROR instead.
wenzelm@18686
  1672
wenzelm@18815
  1673
* Isar: theory setup now has type (theory -> theory), instead of a
wenzelm@18722
  1674
list.  INCOMPATIBILITY, may use #> to compose setup functions.
wenzelm@18722
  1675
wenzelm@24706
  1676
* Isar: ML toplevel pretty printer for type Proof.context, subject to
wenzelm@24706
  1677
ProofContext.debug/verbose flags.
wenzelm@18815
  1678
wenzelm@18815
  1679
* Isar: Toplevel.theory_to_proof admits transactions that modify the
wenzelm@18815
  1680
theory before entering a proof state.  Transactions now always see a
wenzelm@18815
  1681
quasi-functional intermediate checkpoint, both in interactive and
wenzelm@18590
  1682
batch mode.
wenzelm@18567
  1683
wenzelm@24867
  1684
* Isar: simplified interfaces for outer syntax.  Renamed
wenzelm@24867
  1685
OuterSyntax.add_keywords to OuterSyntax.keywords.  Removed
wenzelm@24867
  1686
OuterSyntax.add_parsers -- this functionality is now included in
wenzelm@24867
  1687
OuterSyntax.command etc.  INCOMPATIBILITY.
wenzelm@24867
  1688
wenzelm@17878
  1689
* Simplifier: the simpset of a running simplification process now
wenzelm@17878
  1690
contains a proof context (cf. Simplifier.the_context), which is the
wenzelm@17878
  1691
very context that the initial simpset has been retrieved from (by
wenzelm@17890
  1692
simpset_of/local_simpset_of).  Consequently, all plug-in components
wenzelm@17878
  1693
(solver, looper etc.) may depend on arbitrary proof data.
wenzelm@17878
  1694
wenzelm@17878
  1695
* Simplifier.inherit_context inherits the proof context (plus the
wenzelm@17878
  1696
local bounds) of the current simplification process; any simproc
wenzelm@17878
  1697
etc. that calls the Simplifier recursively should do this!  Removed
wenzelm@17878
  1698
former Simplifier.inherit_bounds, which is already included here --
wenzelm@17890
  1699
INCOMPATIBILITY.  Tools based on low-level rewriting may even have to
wenzelm@17890
  1700
specify an explicit context using Simplifier.context/theory_context.
wenzelm@17878
  1701
wenzelm@17878
  1702
* Simplifier/Classical Reasoner: more abstract interfaces
wenzelm@17878
  1703
change_simpset/claset for modifying the simpset/claset reference of a
wenzelm@17878
  1704
theory; raw versions simpset/claset_ref etc. have been discontinued --
wenzelm@17878
  1705
INCOMPATIBILITY.
wenzelm@17878
  1706
wenzelm@18540
  1707
* Provers: more generic wrt. syntax of object-logics, avoid hardwired
wenzelm@18540
  1708
"Trueprop" etc.
wenzelm@18540
  1709
wenzelm@17878
  1710
wenzelm@20988
  1711
*** System ***
wenzelm@20988
  1712
wenzelm@25433
  1713
* settings: the default heap location within ISABELLE_HOME_USER now
wenzelm@25433
  1714
includes ISABELLE_IDENTIFIER.  This simplifies use of multiple
wenzelm@25433
  1715
Isabelle installations.
wenzelm@21471
  1716
wenzelm@20988
  1717
* isabelle-process: option -S (secure mode) disables some critical
wenzelm@20988
  1718
operations, notably runtime compilation and evaluation of ML source
wenzelm@20988
  1719
code.
wenzelm@20988
  1720
wenzelm@24891
  1721
* Basic Isabelle mode for jEdit, see Isabelle/lib/jedit/.
wenzelm@24891
  1722
wenzelm@24801
  1723
* Support for parallel execution, using native multicore support of
wenzelm@24800
  1724
Poly/ML 5.1.  The theory loader exploits parallelism when processing
wenzelm@24800
  1725
independent theories, according to the given theory header
wenzelm@24800
  1726
specifications. The maximum number of worker threads is specified via
wenzelm@24800
  1727
usedir option -M or the "max-threads" setting in Proof General. A
wenzelm@24800
  1728
speedup factor of 1.5--3.5 can be expected on a 4-core machine, and up
wenzelm@24800
  1729
to 6 on a 8-core machine.  User-code needs to observe certain
wenzelm@24800
  1730
guidelines for thread-safe programming, see appendix A in the Isar
wenzelm@24800
  1731
Implementation manual.
wenzelm@24210
  1732
wenzelm@17754
  1733
wenzelm@25448
  1734
wenzelm@17720
  1735
New in Isabelle2005 (October 2005)
wenzelm@17720
  1736
----------------------------------
wenzelm@14655
  1737
wenzelm@14655
  1738
*** General ***
wenzelm@14655
  1739
nipkow@15130
  1740
* Theory headers: the new header syntax for Isar theories is
nipkow@15130
  1741
nipkow@15130
  1742
  theory <name>
wenzelm@16234
  1743
  imports <theory1> ... <theoryN>
wenzelm@16234
  1744
  uses <file1> ... <fileM>
nipkow@15130
  1745
  begin
nipkow@15130
  1746
wenzelm@16234
  1747
where the 'uses' part is optional.  The previous syntax
wenzelm@16234
  1748
wenzelm@16234
  1749
  theory <name> = <theory1> + ... + <theoryN>:
wenzelm@16234
  1750
wenzelm@16717
  1751
will disappear in the next release.  Use isatool fixheaders to convert
wenzelm@16717
  1752
existing theory files.  Note that there is no change in ancient
wenzelm@17371
  1753
non-Isar theories now, but these will disappear soon.
nipkow@15130
  1754
berghofe@15475
  1755
* Theory loader: parent theories can now also be referred to via
wenzelm@16234
  1756
relative and absolute paths.
wenzelm@16234
  1757
wenzelm@17408
  1758
* Command 'find_theorems' searches for a list of criteria instead of a
wenzelm@17408
  1759
list of constants. Known criteria are: intro, elim, dest, name:string,
wenzelm@17408
  1760
simp:term, and any term. Criteria can be preceded by '-' to select
wenzelm@17408
  1761
theorems that do not match. Intro, elim, dest select theorems that
wenzelm@17408
  1762
match the current goal, name:s selects theorems whose fully qualified
wenzelm@17408
  1763
name contain s, and simp:term selects all simplification rules whose
wenzelm@17408
  1764
lhs match term.  Any other term is interpreted as pattern and selects
wenzelm@17408
  1765
all theorems matching the pattern. Available in ProofGeneral under
wenzelm@17408
  1766
'ProofGeneral -> Find Theorems' or C-c C-f.  Example:
wenzelm@16234
  1767
wenzelm@17275
  1768
  C-c C-f (100) "(_::nat) + _ + _" intro -name: "HOL."
wenzelm@16234
  1769
wenzelm@16234
  1770
prints the last 100 theorems matching the pattern "(_::nat) + _ + _",
wenzelm@16234
  1771
matching the current goal as introduction rule and not having "HOL."
wenzelm@16234
  1772
in their name (i.e. not being defined in theory HOL).
wenzelm@16013
  1773
wenzelm@17408
  1774
* Command 'thms_containing' has been discontinued in favour of
wenzelm@17408
  1775
'find_theorems'; INCOMPATIBILITY.
wenzelm@17408
  1776
wenzelm@17385
  1777
* Communication with Proof General is now 8bit clean, which means that
wenzelm@17385
  1778
Unicode text in UTF-8 encoding may be used within theory texts (both
wenzelm@17408
  1779
formal and informal parts).  Cf. option -U of the Isabelle Proof
wenzelm@17538
  1780
General interface.  Here are some simple examples (cf. src/HOL/ex):
wenzelm@17538
  1781
wenzelm@17538
  1782
  http://isabelle.in.tum.de/library/HOL/ex/Hebrew.html
wenzelm@17538
  1783
  http://isabelle.in.tum.de/library/HOL/ex/Chinese.html
wenzelm@17385
  1784
wenzelm@17425
  1785
* Improved efficiency of the Simplifier and, to a lesser degree, the
wenzelm@17425
  1786
Classical Reasoner.  Typical big applications run around 2 times
wenzelm@17425
  1787
faster.
wenzelm@17425
  1788
wenzelm@15703
  1789
wenzelm@15703
  1790
*** Document preparation ***
wenzelm@15703
  1791
wenzelm@16234
  1792
* Commands 'display_drafts' and 'print_drafts' perform simple output
wenzelm@16234
  1793
of raw sources.  Only those symbols that do not require additional
wenzelm@16234
  1794
LaTeX packages (depending on comments in isabellesym.sty) are
wenzelm@16234
  1795
displayed properly, everything else is left verbatim.  isatool display
wenzelm@16234
  1796
and isatool print are used as front ends (these are subject to the
wenzelm@16234
  1797
DVI/PDF_VIEWER and PRINT_COMMAND settings, respectively).
wenzelm@16234
  1798
wenzelm@17047
  1799
* Command tags control specific markup of certain regions of text,
wenzelm@17047
  1800
notably folding and hiding.  Predefined tags include "theory" (for
wenzelm@17047
  1801
theory begin and end), "proof" for proof commands, and "ML" for
wenzelm@17047
  1802
commands involving ML code; the additional tags "visible" and
wenzelm@17047
  1803
"invisible" are unused by default.  Users may give explicit tag
wenzelm@17047
  1804
specifications in the text, e.g. ''by %invisible (auto)''.  The
wenzelm@17047
  1805
interpretation of tags is determined by the LaTeX job during document
wenzelm@17047
  1806
preparation: see option -V of isatool usedir, or options -n and -t of
wenzelm@17047
  1807
isatool document, or even the LaTeX macros \isakeeptag, \isafoldtag,
wenzelm@17047
  1808
\isadroptag.
wenzelm@17047
  1809
wenzelm@17047
  1810
Several document versions may be produced at the same time via isatool
wenzelm@17047
  1811
usedir (the generated index.html will link all of them).  Typical
wenzelm@17047
  1812
specifications include ''-V document=theory,proof,ML'' to present
wenzelm@17047
  1813
theory/proof/ML parts faithfully, ''-V outline=/proof,/ML'' to fold
wenzelm@17047
  1814
proof and ML commands, and ''-V mutilated=-theory,-proof,-ML'' to omit
wenzelm@17047
  1815
these parts without any formal replacement text.  The Isabelle site
wenzelm@17047
  1816
default settings produce ''document'' and ''outline'' versions as
wenzelm@17047
  1817
specified above.
wenzelm@16234
  1818
haftmann@17402
  1819
* Several new antiquotations:
wenzelm@15979
  1820
wenzelm@15979
  1821
  @{term_type term} prints a term with its type annotated;
wenzelm@15979
  1822
wenzelm@15979
  1823
  @{typeof term} prints the type of a term;
wenzelm@15979
  1824
wenzelm@16234
  1825
  @{const const} is the same as @{term const}, but checks that the
wenzelm@16234
  1826
  argument is a known logical constant;
wenzelm@15979
  1827
wenzelm@15979
  1828
  @{term_style style term} and @{thm_style style thm} print a term or
wenzelm@16234
  1829
  theorem applying a "style" to it
wenzelm@16234
  1830
wenzelm@17117
  1831
  @{ML text}
wenzelm@17117
  1832
wenzelm@16234
  1833
Predefined styles are 'lhs' and 'rhs' printing the lhs/rhs of
wenzelm@16234
  1834
definitions, equations, inequations etc., 'concl' printing only the
schirmer@17393
  1835
conclusion of a meta-logical statement theorem, and 'prem1' .. 'prem19'
wenzelm@16234
  1836
to print the specified premise.  TermStyle.add_style provides an ML
wenzelm@16234
  1837
interface for introducing further styles.  See also the "LaTeX Sugar"
wenzelm@17117
  1838
document practical applications.  The ML antiquotation prints
wenzelm@17117
  1839
type-checked ML expressions verbatim.
wenzelm@16234
  1840
wenzelm@17259
  1841
* Markup commands 'chapter', 'section', 'subsection', 'subsubsection',
wenzelm@17259
  1842
and 'text' support optional locale specification '(in loc)', which
wenzelm@17269
  1843
specifies the default context for interpreting antiquotations.  For
wenzelm@17269
  1844
example: 'text (in lattice) {* @{thm inf_assoc}*}'.
wenzelm@17259
  1845
wenzelm@17259
  1846
* Option 'locale=NAME' of antiquotations specifies an alternative
wenzelm@17259
  1847
context interpreting the subsequent argument.  For example: @{thm
wenzelm@17269
  1848
[locale=lattice] inf_assoc}.
wenzelm@17259
  1849
wenzelm@17097
  1850
* Proper output of proof terms (@{prf ...} and @{full_prf ...}) within
wenzelm@17097
  1851
a proof context.
wenzelm@17097
  1852
wenzelm@17097
  1853
* Proper output of antiquotations for theory commands involving a
wenzelm@17097
  1854
proof context (such as 'locale' or 'theorem (in loc) ...').
wenzelm@17097
  1855
wenzelm@17193
  1856
* Delimiters of outer tokens (string etc.) now produce separate LaTeX
wenzelm@17193
  1857
macros (\isachardoublequoteopen, isachardoublequoteclose etc.).
wenzelm@17193
  1858
wenzelm@17193
  1859
* isatool usedir: new option -C (default true) controls whether option
wenzelm@17193
  1860
-D should include a copy of the original document directory; -C false
wenzelm@17193
  1861
prevents unwanted effects such as copying of administrative CVS data.
wenzelm@17193
  1862
wenzelm@16234
  1863
wenzelm@16234
  1864
*** Pure ***
wenzelm@16234
  1865
wenzelm@16234
  1866
* Considerably improved version of 'constdefs' command.  Now performs
wenzelm@16234
  1867
automatic type-inference of declared constants; additional support for
wenzelm@16234
  1868
local structure declarations (cf. locales and HOL records), see also
wenzelm@16234
  1869
isar-ref manual.  Potential INCOMPATIBILITY: need to observe strictly
wenzelm@16234
  1870
sequential dependencies of definitions within a single 'constdefs'
wenzelm@16234
  1871
section; moreover, the declared name needs to be an identifier.  If
wenzelm@16234
  1872
all fails, consider to fall back on 'consts' and 'defs' separately.
wenzelm@16234
  1873
wenzelm@16234
  1874
* Improved indexed syntax and implicit structures.  First of all,
wenzelm@16234
  1875
indexed syntax provides a notational device for subscripted
wenzelm@16234
  1876
application, using the new syntax \<^bsub>term\<^esub> for arbitrary
wenzelm@16234
  1877
expressions.  Secondly, in a local context with structure
wenzelm@16234
  1878
declarations, number indexes \<^sub>n or the empty index (default
wenzelm@16234
  1879
number 1) refer to a certain fixed variable implicitly; option
wenzelm@16234
  1880
show_structs controls printing of implicit structures.  Typical
wenzelm@16234
  1881
applications of these concepts involve record types and locales.
wenzelm@16234
  1882
wenzelm@16234
  1883
* New command 'no_syntax' removes grammar declarations (and
wenzelm@16234
  1884
translations) resulting from the given syntax specification, which is
wenzelm@16234
  1885
interpreted in the same manner as for the 'syntax' command.
wenzelm@16234
  1886
wenzelm@16234
  1887
* 'Advanced' translation functions (parse_translation etc.) may depend
wenzelm@16234
  1888
on the signature of the theory context being presently used for
wenzelm@16234
  1889
parsing/printing, see also isar-ref manual.
wenzelm@16234
  1890
wenzelm@16856
  1891
* Improved 'oracle' command provides a type-safe interface to turn an
wenzelm@16856
  1892
ML expression of type theory -> T -> term into a primitive rule of
wenzelm@16856
  1893
type theory -> T -> thm (i.e. the functionality of Thm.invoke_oracle
wenzelm@16856
  1894
is already included here); see also FOL/ex/IffExample.thy;
wenzelm@16856
  1895
INCOMPATIBILITY.
wenzelm@16856
  1896
wenzelm@17275
  1897
* axclass: name space prefix for class "c" is now "c_class" (was "c"
wenzelm@17275
  1898
before); "cI" is no longer bound, use "c.intro" instead.
wenzelm@17275
  1899
INCOMPATIBILITY.  This change avoids clashes of fact bindings for
wenzelm@17275
  1900
axclasses vs. locales.
wenzelm@17275
  1901
wenzelm@16234
  1902
* Improved internal renaming of symbolic identifiers -- attach primes
wenzelm@16234
  1903
instead of base 26 numbers.
wenzelm@16234
  1904
wenzelm@16234
  1905
* New flag show_question_marks controls printing of leading question
wenzelm@16234
  1906
marks in schematic variable names.
wenzelm@16234
  1907
wenzelm@16234
  1908
* In schematic variable names, *any* symbol following \<^isub> or
wenzelm@16234
  1909
\<^isup> is now treated as part of the base name.  For example, the
wenzelm@16234
  1910
following works without printing of awkward ".0" indexes:
wenzelm@16234
  1911
wenzelm@16234
  1912
  lemma "x\<^isub>1 = x\<^isub>2 ==> x\<^isub>2 = x\<^isub>1"
wenzelm@16234
  1913
    by simp
wenzelm@16234
  1914
wenzelm@16234
  1915
* Inner syntax includes (*(*nested*) comments*).
wenzelm@16234
  1916
wenzelm@17548
  1917
* Pretty printer now supports unbreakable blocks, specified in mixfix
wenzelm@16234
  1918
annotations as "(00...)".
wenzelm@16234
  1919
wenzelm@16234
  1920
* Clear separation of logical types and nonterminals, where the latter
wenzelm@16234
  1921
may only occur in 'syntax' specifications or type abbreviations.
wenzelm@16234
  1922
Before that distinction was only partially implemented via type class
wenzelm@16234
  1923
"logic" vs. "{}".  Potential INCOMPATIBILITY in rare cases of improper
wenzelm@16234
  1924
use of 'types'/'consts' instead of 'nonterminals'/'syntax'.  Some very
wenzelm@16234
  1925
exotic syntax specifications may require further adaption
wenzelm@17691
  1926
(e.g. Cube/Cube.thy).
wenzelm@16234
  1927
wenzelm@16234
  1928
* Removed obsolete type class "logic", use the top sort {} instead.
wenzelm@16234
  1929
Note that non-logical types should be declared as 'nonterminals'
wenzelm@16234
  1930
rather than 'types'.  INCOMPATIBILITY for new object-logic
wenzelm@16234
  1931
specifications.
wenzelm@16234
  1932
ballarin@17095
  1933
* Attributes 'induct' and 'cases': type or set names may now be
ballarin@17095
  1934
locally fixed variables as well.
ballarin@17095
  1935
wenzelm@16234
  1936
* Simplifier: can now control the depth to which conditional rewriting
wenzelm@16234
  1937
is traced via the PG menu Isabelle -> Settings -> Trace Simp Depth
wenzelm@16234
  1938
Limit.
wenzelm@16234
  1939
wenzelm@16234
  1940
* Simplifier: simplification procedures may now take the current
wenzelm@16234
  1941
simpset into account (cf. Simplifier.simproc(_i) / mk_simproc
wenzelm@16234
  1942
interface), which is very useful for calling the Simplifier
wenzelm@16234
  1943
recursively.  Minor INCOMPATIBILITY: the 'prems' argument of simprocs
wenzelm@16234
  1944
is gone -- use prems_of_ss on the simpset instead.  Moreover, the
wenzelm@16234
  1945
low-level mk_simproc no longer applies Logic.varify internally, to
wenzelm@16234
  1946
allow for use in a context of fixed variables.
wenzelm@16234
  1947
wenzelm@16234
  1948
* thin_tac now works even if the assumption being deleted contains !!
wenzelm@16234
  1949
or ==>.  More generally, erule now works even if the major premise of
wenzelm@16234
  1950
the elimination rule contains !! or ==>.
wenzelm@16234
  1951
wenzelm@17597
  1952
* Method 'rules' has been renamed to 'iprover'. INCOMPATIBILITY.
nipkow@17590
  1953
wenzelm@16234
  1954
* Reorganized bootstrapping of the Pure theories; CPure is now derived
wenzelm@16234
  1955
from Pure, which contains all common declarations already.  Both
wenzelm@16234
  1956
theories are defined via plain Isabelle/Isar .thy files.
wenzelm@16234
  1957
INCOMPATIBILITY: elements of CPure (such as the CPure.intro /
wenzelm@16234
  1958
CPure.elim / CPure.dest attributes) now appear in the Pure name space;
wenzelm@16234
  1959
use isatool fixcpure to adapt your theory and ML sources.
wenzelm@16234
  1960
wenzelm@16234
  1961
* New syntax 'name(i-j, i-, i, ...)' for referring to specific
wenzelm@16234
  1962
selections of theorems in named facts via index ranges.
wenzelm@16234
  1963
wenzelm@17097
  1964
* 'print_theorems': in theory mode, really print the difference
wenzelm@17097
  1965
wrt. the last state (works for interactive theory development only),
wenzelm@17097
  1966
in proof mode print all local facts (cf. 'print_facts');
wenzelm@17097
  1967
wenzelm@17397
  1968
* 'hide': option '(open)' hides only base names.
wenzelm@17397
  1969
wenzelm@17275
  1970
* More efficient treatment of intermediate checkpoints in interactive
wenzelm@17275
  1971
theory development.
wenzelm@17275
  1972
berghofe@17663
  1973
* Code generator is now invoked via code_module (incremental code
wenzelm@17664
  1974
generation) and code_library (modular code generation, ML structures
wenzelm@17664
  1975
for each theory).  INCOMPATIBILITY: new keywords 'file' and 'contains'
wenzelm@17664
  1976
must be quoted when used as identifiers.
wenzelm@17664
  1977
wenzelm@17664
  1978
* New 'value' command for reading, evaluating and printing terms using
wenzelm@17664
  1979
the code generator.  INCOMPATIBILITY: command keyword 'value' must be
wenzelm@17664
  1980
quoted when used as identifier.
berghofe@17663
  1981
wenzelm@16234
  1982
wenzelm@16234
  1983
*** Locales ***
ballarin@17095
  1984
wenzelm@17385
  1985
* New commands for the interpretation of locale expressions in
wenzelm@17385
  1986
theories (1), locales (2) and proof contexts (3).  These generate
wenzelm@17385
  1987
proof obligations from the expression specification.  After the
wenzelm@17385
  1988
obligations have been discharged, theorems of the expression are added
wenzelm@17385
  1989
to the theory, target locale or proof context.  The synopsis of the
wenzelm@17385
  1990
commands is a follows:
wenzelm@17385
  1991
ballarin@17095
  1992
  (1) interpretation expr inst
ballarin@17095
  1993
  (2) interpretation target < expr
ballarin@17095
  1994
  (3) interpret expr inst
wenzelm@17385
  1995
ballarin@17095
  1996
Interpretation in theories and proof contexts require a parameter
ballarin@17095
  1997
instantiation of terms from the current context.  This is applied to
wenzelm@17385
  1998
specifications and theorems of the interpreted expression.
wenzelm@17385
  1999
Interpretation in locales only permits parameter renaming through the
wenzelm@17385
  2000
locale expression.  Interpretation is smart in that interpretations
wenzelm@17385
  2001
that are active already do not occur in proof obligations, neither are
wenzelm@17385
  2002
instantiated theorems stored in duplicate.  Use 'print_interps' to
wenzelm@17385
  2003
inspect active interpretations of a particular locale.  For details,
ballarin@17436
  2004
see the Isar Reference manual.  Examples can be found in
ballarin@17436
  2005
HOL/Finite_Set.thy and HOL/Algebra/UnivPoly.thy.
wenzelm@16234
  2006
wenzelm@16234
  2007
INCOMPATIBILITY: former 'instantiate' has been withdrawn, use
wenzelm@16234
  2008
'interpret' instead.
wenzelm@16234
  2009
wenzelm@17385
  2010
* New context element 'constrains' for adding type constraints to
wenzelm@17385
  2011
parameters.
wenzelm@17385
  2012
wenzelm@17385
  2013
* Context expressions: renaming of parameters with syntax
wenzelm@17385
  2014
redeclaration.
ballarin@17095
  2015
ballarin@17095
  2016
* Locale declaration: 'includes' disallowed.
ballarin@17095
  2017
wenzelm@16234
  2018
* Proper static binding of attribute syntax -- i.e. types / terms /
wenzelm@16234
  2019
facts mentioned as arguments are always those of the locale definition
wenzelm@16234
  2020
context, independently of the context of later invocations.  Moreover,
wenzelm@16234
  2021
locale operations (renaming and type / term instantiation) are applied
wenzelm@16234
  2022
to attribute arguments as expected.
wenzelm@16234
  2023
wenzelm@16234
  2024
INCOMPATIBILITY of the ML interface: always pass Attrib.src instead of
wenzelm@16234
  2025
actual attributes; rare situations may require Attrib.attribute to
wenzelm@16234
  2026
embed those attributes into Attrib.src that lack concrete syntax.
wenzelm@16234
  2027
Attribute implementations need to cooperate properly with the static
wenzelm@16234
  2028
binding mechanism.  Basic parsers Args.XXX_typ/term/prop and
wenzelm@16234
  2029
Attrib.XXX_thm etc. already do the right thing without further
wenzelm@16234
  2030
intervention.  Only unusual applications -- such as "where" or "of"
wenzelm@16234
  2031
(cf. src/Pure/Isar/attrib.ML), which process arguments depending both
wenzelm@16234
  2032
on the context and the facts involved -- may have to assign parsed
wenzelm@16234
  2033
values to argument tokens explicitly.
wenzelm@16234
  2034
wenzelm@16234
  2035
* Changed parameter management in theorem generation for long goal
wenzelm@16234
  2036
statements with 'includes'.  INCOMPATIBILITY: produces a different
wenzelm@16234
  2037
theorem statement in rare situations.
wenzelm@16234
  2038
ballarin@17228
  2039
* Locale inspection command 'print_locale' omits notes elements.  Use
ballarin@17228
  2040
'print_locale!' to have them included in the output.
ballarin@17228
  2041
wenzelm@16234
  2042
wenzelm@16234
  2043
*** Provers ***
wenzelm@16234
  2044
wenzelm@16234
  2045
* Provers/hypsubst.ML: improved version of the subst method, for
wenzelm@16234
  2046
single-step rewriting: it now works in bound variable contexts. New is
wenzelm@16234
  2047
'subst (asm)', for rewriting an assumption.  INCOMPATIBILITY: may
wenzelm@16234
  2048
rewrite a different subterm than the original subst method, which is
wenzelm@16234
  2049
still available as 'simplesubst'.
wenzelm@16234
  2050
wenzelm@16234
  2051
* Provers/quasi.ML: new transitivity reasoners for transitivity only
wenzelm@16234
  2052
and quasi orders.
wenzelm@16234
  2053
wenzelm@16234
  2054
* Provers/trancl.ML: new transitivity reasoner for transitive and
wenzelm@16234
  2055
reflexive-transitive closure of relations.
wenzelm@16234
  2056
wenzelm@16234
  2057
* Provers/blast.ML: new reference depth_limit to make blast's depth
wenzelm@16234
  2058
limit (previously hard-coded with a value of 20) user-definable.
wenzelm@16234
  2059
wenzelm@16234
  2060
* Provers/simplifier.ML has been moved to Pure, where Simplifier.setup
wenzelm@16234
  2061
is peformed already.  Object-logics merely need to finish their
wenzelm@16234
  2062
initial simpset configuration as before.  INCOMPATIBILITY.
wenzelm@15703
  2063
berghofe@15475
  2064
schirmer@14700
  2065
*** HOL ***
schirmer@14700
  2066
wenzelm@16234
  2067
* Symbolic syntax of Hilbert Choice Operator is now as follows:
wenzelm@14878
  2068
wenzelm@14878
  2069
  syntax (epsilon)
wenzelm@14878
  2070
    "_Eps" :: "[pttrn, bool] => 'a"    ("(3\<some>_./ _)" [0, 10] 10)
wenzelm@14878
  2071
wenzelm@16234
  2072
The symbol \<some> is displayed as the alternative epsilon of LaTeX
wenzelm@16234
  2073
and x-symbol; use option '-m epsilon' to get it actually printed.
wenzelm@16234
  2074
Moreover, the mathematically important symbolic identifier \<epsilon>
wenzelm@16234
  2075
becomes available as variable, constant etc.  INCOMPATIBILITY,
wenzelm@16234
  2076
wenzelm@16234
  2077
* "x > y" abbreviates "y < x" and "x >= y" abbreviates "y <= x".
wenzelm@16234
  2078
Similarly for all quantifiers: "ALL x > y" etc.  The x-symbol for >=
wenzelm@17371
  2079
is \<ge>. New transitivity rules have been added to HOL/Orderings.thy to
avigad@17016
  2080
support corresponding Isar calculations.
wenzelm@16234
  2081
wenzelm@16234
  2082
* "{x:A. P}" abbreviates "{x. x:A & P}", and similarly for "\<in>"
wenzelm@16234
  2083
instead of ":".
wenzelm@16234
  2084
wenzelm@16234
  2085
* theory SetInterval: changed the syntax for open intervals:
wenzelm@16234
  2086
wenzelm@16234
  2087
  Old       New
wenzelm@16234
  2088
  {..n(}    {..<n}
wenzelm@16234
  2089
  {)n..}    {n<..}
wenzelm@16234
  2090
  {m..n(}   {m..<n}
wenzelm@16234
  2091
  {)m..n}   {m<..n}
wenzelm@16234
  2092
  {)m..n(}  {m<..<n}
wenzelm@16234
  2093
wenzelm@16234
  2094
The old syntax is still supported but will disappear in the next
wenzelm@16234
  2095
release.  For conversion use the following Emacs search and replace
wenzelm@16234
  2096
patterns (these are not perfect but work quite well):
nipkow@15046
  2097
nipkow@15046
  2098
  {)\([^\.]*\)\.\.  ->  {\1<\.\.}
nipkow@15046
  2099
  \.\.\([^(}]*\)(}  ->  \.\.<\1}
nipkow@15046
  2100
wenzelm@17533
  2101
* Theory Commutative_Ring (in Library): method comm_ring for proving
wenzelm@17533
  2102
equalities in commutative rings; method 'algebra' provides a generic
wenzelm@17533
  2103
interface.
wenzelm@17389
  2104
wenzelm@17389
  2105
* Theory Finite_Set: changed the syntax for 'setsum', summation over
wenzelm@16234
  2106
finite sets: "setsum (%x. e) A", which used to be "\<Sum>x:A. e", is
wenzelm@17371
  2107
now either "SUM x:A. e" or "\<Sum>x \<in> A. e". The bound variable can
paulson@17189
  2108
be a tuple pattern.
wenzelm@16234
  2109
wenzelm@16234
  2110
Some new syntax forms are available:
wenzelm@16234
  2111
wenzelm@16234
  2112
  "\<Sum>x | P. e"      for     "setsum (%x. e) {x. P}"
wenzelm@16234
  2113
  "\<Sum>x = a..b. e"   for     "setsum (%x. e) {a..b}"
wenzelm@16234
  2114
  "\<Sum>x = a..<b. e"  for     "setsum (%x. e) {a..<b}"
wenzelm@16234
  2115
  "\<Sum>x < k. e"      for     "setsum (%x. e) {..<k}"
wenzelm@16234
  2116
wenzelm@16234
  2117
The latter form "\<Sum>x < k. e" used to be based on a separate
wenzelm@16234
  2118
function "Summation", which has been discontinued.
wenzelm@16234
  2119
wenzelm@16234
  2120
* theory Finite_Set: in structured induction proofs, the insert case
wenzelm@16234
  2121
is now 'case (insert x F)' instead of the old counterintuitive 'case
wenzelm@16234
  2122
(insert F x)'.
wenzelm@16234
  2123
wenzelm@16234
  2124
* The 'refute' command has been extended to support a much larger
wenzelm@16234
  2125
fragment of HOL, including axiomatic type classes, constdefs and
wenzelm@16234
  2126
typedefs, inductive datatypes and recursion.
wenzelm@16234
  2127
webertj@17700
  2128
* New tactics 'sat' and 'satx' to prove propositional tautologies.
webertj@17700
  2129
Requires zChaff with proof generation to be installed.  See
webertj@17700
  2130
HOL/ex/SAT_Examples.thy for examples.
webertj@17619
  2131
wenzelm@16234
  2132
* Datatype induction via method 'induct' now preserves the name of the
wenzelm@16234
  2133
induction variable. For example, when proving P(xs::'a list) by
wenzelm@16234
  2134
induction on xs, the induction step is now P(xs) ==> P(a#xs) rather
wenzelm@16234
  2135
than P(list) ==> P(a#list) as previously.  Potential INCOMPATIBILITY
wenzelm@16234
  2136
in unstructured proof scripts.
wenzelm@16234
  2137
wenzelm@16234
  2138
* Reworked implementation of records.  Improved scalability for
wenzelm@16234
  2139
records with many fields, avoiding performance problems for type
wenzelm@16234
  2140
inference. Records are no longer composed of nested field types, but
wenzelm@16234
  2141
of nested extension types. Therefore the record type only grows linear
wenzelm@16234
  2142
in the number of extensions and not in the number of fields.  The
wenzelm@16234
  2143
top-level (users) view on records is preserved.  Potential
wenzelm@16234
  2144
INCOMPATIBILITY only in strange cases, where the theory depends on the
wenzelm@16234
  2145
old record representation. The type generated for a record is called
wenzelm@16234
  2146
<record_name>_ext_type.
wenzelm@16234
  2147
wenzelm@16234
  2148
Flag record_quick_and_dirty_sensitive can be enabled to skip the
wenzelm@16234
  2149
proofs triggered by a record definition or a simproc (if
wenzelm@16234
  2150
quick_and_dirty is enabled).  Definitions of large records can take
wenzelm@16234
  2151
quite long.
wenzelm@16234
  2152
wenzelm@16234
  2153
New simproc record_upd_simproc for simplification of multiple record
wenzelm@16234
  2154
updates enabled by default.  Moreover, trivial updates are also
wenzelm@16234
  2155
removed: r(|x := x r|) = r.  INCOMPATIBILITY: old proofs break
wenzelm@16234
  2156
occasionally, since simplification is more powerful by default.
wenzelm@16234
  2157
wenzelm@17275
  2158
* typedef: proper support for polymorphic sets, which contain extra
wenzelm@17275
  2159
type-variables in the term.
wenzelm@17275
  2160
wenzelm@16234
  2161
* Simplifier: automatically reasons about transitivity chains
wenzelm@16234
  2162
involving "trancl" (r^+) and "rtrancl" (r^*) by setting up tactics
wenzelm@16234
  2163
provided by Provers/trancl.ML as additional solvers.  INCOMPATIBILITY:
wenzelm@16234
  2164
old proofs break occasionally as simplification may now solve more
wenzelm@16234
  2165
goals than previously.
wenzelm@16234
  2166
wenzelm@16234
  2167
* Simplifier: converts x <= y into x = y if assumption y <= x is
wenzelm@16234
  2168
present.  Works for all partial orders (class "order"), in particular
wenzelm@16234
  2169
numbers and sets.  For linear orders (e.g. numbers) it treats ~ x < y
wenzelm@16234
  2170
just like y <= x.
wenzelm@16234
  2171
wenzelm@16234
  2172
* Simplifier: new simproc for "let x = a in f x".  If a is a free or
wenzelm@16234
  2173
bound variable or a constant then the let is unfolded.  Otherwise
wenzelm@16234
  2174
first a is simplified to b, and then f b is simplified to g. If
wenzelm@16234
  2175
possible we abstract b from g arriving at "let x = b in h x",
wenzelm@16234
  2176
otherwise we unfold the let and arrive at g.  The simproc can be
wenzelm@16234
  2177
enabled/disabled by the reference use_let_simproc.  Potential
wenzelm@16234
  2178
INCOMPATIBILITY since simplification is more powerful by default.
webertj@15776
  2179
paulson@16563
  2180
* Classical reasoning: the meson method now accepts theorems as arguments.
paulson@16563
  2181
paulson@17595
  2182
* Prover support: pre-release of the Isabelle-ATP linkup, which runs background
paulson@17595
  2183
jobs to provide advice on the provability of subgoals.
paulson@17595
  2184
wenzelm@16891
  2185
* Theory OrderedGroup and Ring_and_Field: various additions and
wenzelm@16891
  2186
improvements to faciliate calculations involving equalities and
wenzelm@16891
  2187
inequalities.
wenzelm@16891
  2188
wenzelm@16891
  2189
The following theorems have been eliminated or modified
wenzelm@16891
  2190
(INCOMPATIBILITY):
avigad@16888
  2191
avigad@16888
  2192
  abs_eq             now named abs_of_nonneg
wenzelm@17371
  2193
  abs_of_ge_0        now named abs_of_nonneg
wenzelm@17371
  2194
  abs_minus_eq       now named abs_of_nonpos
avigad@16888
  2195
  imp_abs_id         now named abs_of_nonneg
avigad@16888
  2196
  imp_abs_neg_id     now named abs_of_nonpos
avigad@16888
  2197
  mult_pos           now named mult_pos_pos
avigad@16888
  2198
  mult_pos_le        now named mult_nonneg_nonneg
avigad@16888
  2199
  mult_pos_neg_le    now named mult_nonneg_nonpos
avigad@16888
  2200
  mult_pos_neg2_le   now named mult_nonneg_nonpos2
avigad@16888
  2201
  mult_neg           now named mult_neg_neg
avigad@16888
  2202
  mult_neg_le        now named mult_nonpos_nonpos
avigad@16888
  2203
obua@23495
  2204
* The following lemmas in Ring_and_Field have been added to the simplifier:
obua@23495
  2205
     
obua@23495
  2206
     zero_le_square
obua@23495
  2207
     not_square_less_zero 
obua@23495
  2208
obua@23495
  2209
  The following lemmas have been deleted from Real/RealPow:
obua@23495
  2210
  
obua@23495
  2211
     realpow_zero_zero
obua@23495
  2212
     realpow_two
obua@23495
  2213
     realpow_less
obua@23495
  2214
     zero_le_power
obua@23495
  2215
     realpow_two_le
obua@23495
  2216
     abs_realpow_two
obua@23495
  2217
     realpow_two_abs     
obua@23495
  2218
wenzelm@16891
  2219
* Theory Parity: added rules for simplifying exponents.
wenzelm@16891
  2220
nipkow@17092
  2221
* Theory List:
nipkow@17092
  2222
nipkow@17092
  2223
The following theorems have been eliminated or modified
nipkow@17092
  2224
(INCOMPATIBILITY):
nipkow@17092
  2225
nipkow@17092
  2226
  list_all_Nil       now named list_all.simps(1)
nipkow@17092
  2227
  list_all_Cons      now named list_all.simps(2)
nipkow@17092
  2228
  list_all_conv      now named list_all_iff
nipkow@17092
  2229
  set_mem_eq         now named mem_iff
nipkow@17092
  2230
wenzelm@16929
  2231
* Theories SetsAndFunctions and BigO (see HOL/Library) support
wenzelm@16929
  2232
asymptotic "big O" calculations.  See the notes in BigO.thy.
wenzelm@16929
  2233
avigad@16888
  2234
avigad@16888
  2235
*** HOL-Complex ***
avigad@16888
  2236
wenzelm@16891
  2237
* Theory RealDef: better support for embedding natural numbers and
wenzelm@16891
  2238
integers in the reals.
wenzelm@16891
  2239
wenzelm@16891
  2240
The following theorems have been eliminated or modified
wenzelm@16891
  2241
(INCOMPATIBILITY):
wenzelm@16891
  2242
avigad@17016
  2243
  exp_ge_add_one_self  now requires no hypotheses
avigad@17016
  2244
  real_of_int_add      reversed direction of equality (use [symmetric])
avigad@17016
  2245
  real_of_int_minus    reversed direction of equality (use [symmetric])
avigad@17016
  2246
  real_of_int_diff     reversed direction of equality (use [symmetric])
avigad@17016
  2247
  real_of_int_mult     reversed direction of equality (use [symmetric])
wenzelm@16891
  2248
wenzelm@16891
  2249
* Theory RComplete: expanded support for floor and ceiling functions.
avigad@16888
  2250
avigad@16962
  2251
* Theory Ln is new, with properties of the natural logarithm
avigad@16962
  2252
wenzelm@17423
  2253
* Hyperreal: There is a new type constructor "star" for making
wenzelm@17423
  2254
nonstandard types.  The old type names are now type synonyms:
wenzelm@17423
  2255
wenzelm@17423
  2256
  hypreal = real star
wenzelm@17423
  2257
  hypnat = nat star
wenzelm@17423
  2258
  hcomplex = complex star
wenzelm@17423
  2259
wenzelm@17423
  2260
* Hyperreal: Many groups of similarly-defined constants have been
huffman@17442
  2261
replaced by polymorphic versions (INCOMPATIBILITY):
wenzelm@17423
  2262
wenzelm@17423
  2263
  star_of <-- hypreal_of_real, hypnat_of_nat, hcomplex_of_complex
wenzelm@17423
  2264
wenzelm@17423
  2265
  starset      <-- starsetNat, starsetC
wenzelm@17423
  2266
  *s*          <-- *sNat*, *sc*
wenzelm@17423
  2267
  starset_n    <-- starsetNat_n, starsetC_n
wenzelm@17423
  2268
  *sn*         <-- *sNatn*, *scn*
wenzelm@17423
  2269
  InternalSets <-- InternalNatSets, InternalCSets
wenzelm@17423
  2270
huffman@17442
  2271
  starfun      <-- starfun{Nat,Nat2,C,RC,CR}
wenzelm@17423
  2272
  *f*          <-- *fNat*, *fNat2*, *fc*, *fRc*, *fcR*
huffman@17442
  2273
  starfun_n    <-- starfun{Nat,Nat2,C,RC,CR}_n
wenzelm@17423
  2274
  *fn*         <-- *fNatn*, *fNat2n*, *fcn*, *fRcn*, *fcRn*
huffman@17442
  2275
  InternalFuns <-- InternalNatFuns, InternalNatFuns2, Internal{C,RC,CR}Funs
wenzelm@17423
  2276
wenzelm@17423
  2277
* Hyperreal: Many type-specific theorems have been removed in favor of
huffman@17442
  2278
theorems specific to various axiomatic type classes (INCOMPATIBILITY):
huffman@17442
  2279
huffman@17442
  2280
  add_commute <-- {hypreal,hypnat,hcomplex}_add_commute
huffman@17442
  2281
  add_assoc   <-- {hypreal,hypnat,hcomplex}_add_assocs
huffman@17442
  2282
  OrderedGroup.add_0 <-- {hypreal,hypnat,hcomplex}_add_zero_left
huffman@17442
  2283
  OrderedGroup.add_0_right <-- {hypreal,hcomplex}_add_zero_right
wenzelm@17423
  2284
  right_minus <-- hypreal_add_minus
huffman@17442
  2285
  left_minus <-- {hypreal,hcomplex}_add_minus_left
huffman@17442
  2286
  mult_commute <-- {hypreal,hypnat,hcomplex}_mult_commute
huffman@17442
  2287
  mult_assoc <-- {hypreal,hypnat,hcomplex}_mult_assoc
huffman@17442
  2288
  mult_1_left <-- {hypreal,hypnat}_mult_1, hcomplex_mult_one_left
wenzelm@17423
  2289
  mult_1_right <-- hcomplex_mult_one_right
wenzelm@17423
  2290
  mult_zero_left <-- hcomplex_mult_zero_left
huffman@17442
  2291
  left_distrib <-- {hypreal,hypnat,hcomplex}_add_mult_distrib
wenzelm@17423
  2292
  right_distrib <-- hypnat_add_mult_distrib2
huffman@17442
  2293
  zero_neq_one <-- {hypreal,hypnat,hcomplex}_zero_not_eq_one
wenzelm@17423
  2294
  right_inverse <-- hypreal_mult_inverse
wenzelm@17423
  2295
  left_inverse <-- hypreal_mult_inverse_left, hcomplex_mult_inv_left
huffman@17442
  2296
  order_refl <-- {hypreal,hypnat}_le_refl
huffman@17442
  2297
  order_trans <-- {hypreal,hypnat}_le_trans
huffman@17442
  2298
  order_antisym <-- {hypreal,hypnat}_le_anti_sym
huffman@17442
  2299
  order_less_le <-- {hypreal,hypnat}_less_le
huffman@17442
  2300
  linorder_linear <-- {hypreal,hypnat}_le_linear
huffman@17442
  2301
  add_left_mono <-- {hypreal,hypnat}_add_left_mono
huffman@17442
  2302
  mult_strict_left_mono <-- {hypreal,hypnat}_mult_less_mono2
wenzelm@17423
  2303
  add_nonneg_nonneg <-- hypreal_le_add_order
wenzelm@17423
  2304
wenzelm@17423
  2305
* Hyperreal: Separate theorems having to do with type-specific
wenzelm@17423
  2306
versions of constants have been merged into theorems that apply to the
huffman@17442
  2307
new polymorphic constants (INCOMPATIBILITY):
huffman@17442
  2308
huffman@17442
  2309
  STAR_UNIV_set <-- {STAR_real,NatStar_real,STARC_complex}_set
huffman@17442
  2310
  STAR_empty_set <-- {STAR,NatStar,STARC}_empty_set
huffman@17442
  2311
  STAR_Un <-- {STAR,NatStar,STARC}_Un
huffman@17442
  2312
  STAR_Int <-- {STAR,NatStar,STARC}_Int
huffman@17442
  2313
  STAR_Compl <-- {STAR,NatStar,STARC}_Compl
huffman@17442
  2314
  STAR_subset <-- {STAR,NatStar,STARC}_subset
huffman@17442
  2315
  STAR_mem <-- {STAR,NatStar,STARC}_mem
huffman@17442
  2316
  STAR_mem_Compl <-- {STAR,STARC}_mem_Compl
huffman@17442
  2317
  STAR_diff <-- {STAR,STARC}_diff
huffman@17442
  2318
  STAR_star_of_image_subset <-- {STAR_hypreal_of_real, NatStar_hypreal_of_real,
huffman@17442
  2319
    STARC_hcomplex_of_complex}_image_subset
huffman@17442
  2320
  starset_n_Un <-- starset{Nat,C}_n_Un
huffman@17442
  2321
  starset_n_Int <-- starset{Nat,C}_n_Int
huffman@17442
  2322
  starset_n_Compl <-- starset{Nat,C}_n_Compl
huffman@17442
  2323
  starset_n_diff <-- starset{Nat,C}_n_diff
huffman@17442
  2324
  InternalSets_Un <-- Internal{Nat,C}Sets_Un
huffman@17442
  2325
  InternalSets_Int <-- Internal{Nat,C}Sets_Int
huffman@17442
  2326
  InternalSets_Compl <-- Internal{Nat,C}Sets_Compl
huffman@17442
  2327
  InternalSets_diff <-- Internal{Nat,C}Sets_diff
huffman@17442
  2328
  InternalSets_UNIV_diff <-- Internal{Nat,C}Sets_UNIV_diff
huffman@17442
  2329
  InternalSets_starset_n <-- Internal{Nat,C}Sets_starset{Nat,C}_n
huffman@17442
  2330
  starset_starset_n_eq <-- starset{Nat,C}_starset{Nat,C}_n_eq
huffman@17442
  2331
  starset_n_starset <-- starset{Nat,C}_n_starset{Nat,C}
huffman@17442
  2332
  starfun_n_starfun <-- starfun{Nat,Nat2,C,RC,CR}_n_starfun{Nat,Nat2,C,RC,CR}
huffman@17442
  2333
  starfun <-- starfun{Nat,Nat2,C,RC,CR}
huffman@17442
  2334
  starfun_mult <-- starfun{Nat,Nat2,C,RC,CR}_mult
huffman@17442
  2335
  starfun_add <-- starfun{Nat,Nat2,C,RC,CR}_add
huffman@17442
  2336
  starfun_minus <-- starfun{Nat,Nat2,C,RC,CR}_minus
huffman@17442
  2337
  starfun_diff <-- starfun{C,RC,CR}_diff
huffman@17442
  2338
  starfun_o <-- starfun{NatNat2,Nat2,_stafunNat,C,C_starfunRC,_starfunCR}_o
huffman@17442
  2339
  starfun_o2 <-- starfun{NatNat2,_stafunNat,C,C_starfunRC,_starfunCR}_o2
huffman@17442
  2340
  starfun_const_fun <-- starfun{Nat,Nat2,C,RC,CR}_const_fun
huffman@17442
  2341
  starfun_inverse <-- starfun{Nat,C,RC,CR}_inverse
huffman@17442
  2342
  starfun_eq <-- starfun{Nat,Nat2,C,RC,CR}_eq
huffman@17442
  2343
  starfun_eq_iff <-- starfun{C,RC,CR}_eq_iff
wenzelm@17423
  2344
  starfun_Id <-- starfunC_Id
huffman@17442
  2345
  starfun_approx <-- starfun{Nat,CR}_approx
huffman@17442
  2346
  starfun_capprox <-- starfun{C,RC}_capprox
wenzelm@17423
  2347
  starfun_abs <-- starfunNat_rabs
huffman@17442
  2348
  starfun_lambda_cancel <-- starfun{C,CR,RC}_lambda_cancel
huffman@17442
  2349
  starfun_lambda_cancel2 <-- starfun{C,CR,RC}_lambda_cancel2
wenzelm@17423
  2350
  starfun_mult_HFinite_approx <-- starfunCR_mult_HFinite_capprox
huffman@17442
  2351
  starfun_mult_CFinite_capprox <-- starfun{C,RC}_mult_CFinite_capprox
huffman@17442
  2352
  starfun_add_capprox <-- starfun{C,RC}_add_capprox
wenzelm@17423
  2353
  starfun_add_approx <-- starfunCR_add_approx
wenzelm@17423
  2354
  starfun_inverse_inverse <-- starfunC_inverse_inverse
huffman@17442
  2355
  starfun_divide <-- starfun{C,CR,RC}_divide
huffman@17442
  2356
  starfun_n <-- starfun{Nat,C}_n
huffman@17442
  2357
  starfun_n_mult <-- starfun{Nat,C}_n_mult
huffman@17442
  2358
  starfun_n_add <-- starfun{Nat,C}_n_add
wenzelm@17423
  2359
  starfun_n_add_minus <-- starfunNat_n_add_minus
huffman@17442
  2360
  starfun_n_const_fun <-- starfun{Nat,C}_n_const_fun
huffman@17442
  2361
  starfun_n_minus <-- starfun{Nat,C}_n_minus
huffman@17442
  2362
  starfun_n_eq <-- starfun{Nat,C}_n_eq
huffman@17442
  2363
huffman@17442
  2364
  star_n_add <-- {hypreal,hypnat,hcomplex}_add
huffman@17442
  2365
  star_n_minus <-- {hypreal,hcomplex}_minus
huffman@17442
  2366
  star_n_diff <-- {hypreal,hcomplex}_diff
huffman@17442
  2367
  star_n_mult <-- {hypreal,hcomplex}_mult
huffman@17442
  2368
  star_n_inverse <-- {hypreal,hcomplex}_inverse
huffman@17442
  2369
  star_n_le <-- {hypreal,hypnat}_le
huffman@17442
  2370
  star_n_less <-- {hypreal,hypnat}_less
huffman@17442
  2371
  star_n_zero_num <-- {hypreal,hypnat,hcomplex}_zero_num
huffman@17442
  2372
  star_n_one_num <-- {hypreal,hypnat,hcomplex}_one_num
wenzelm@17423
  2373
  star_n_abs <-- hypreal_hrabs
wenzelm@17423
  2374
  star_n_divide <-- hcomplex_divide
wenzelm@17423
  2375
huffman@17442
  2376
  star_of_add <-- {hypreal_of_real,hypnat_of_nat,hcomplex_of_complex}_add
huffman@17442
  2377
  star_of_minus <-- {hypreal_of_real,hcomplex_of_complex}_minus
wenzelm@17423
  2378
  star_of_diff <-- hypreal_of_real_diff
huffman@17442
  2379
  star_of_mult <-- {hypreal_of_real,hypnat_of_nat,hcomplex_of_complex}_mult
huffman@17442
  2380
  star_of_one <-- {hypreal_of_real,hcomplex_of_complex}_one
huffman@17442
  2381
  star_of_zero <-- {hypreal_of_real,hypnat_of_nat,hcomplex_of_complex}_zero
huffman@17442
  2382
  star_of_le <-- {hypreal_of_real,hypnat_of_nat}_le_iff
huffman@17442
  2383
  star_of_less <-- {hypreal_of_real,hypnat_of_nat}_less_iff
huffman@17442
  2384
  star_of_eq <-- {hypreal_of_real,hypnat_of_nat,hcomplex_of_complex}_eq_iff
huffman@17442
  2385
  star_of_inverse <-- {hypreal_of_real,hcomplex_of_complex}_inverse
huffman@17442
  2386
  star_of_divide <-- {hypreal_of_real,hcomplex_of_complex}_divide
huffman@17442
  2387
  star_of_of_nat <-- {hypreal_of_real,hcomplex_of_complex}_of_nat
huffman@17442
  2388
  star_of_of_int <-- {hypreal_of_real,hcomplex_of_complex}_of_int
huffman@17442
  2389
  star_of_number_of <-- {hypreal,hcomplex}_number_of
wenzelm@17423
  2390
  star_of_number_less <-- number_of_less_hypreal_of_real_iff
wenzelm@17423
  2391
  star_of_number_le <-- number_of_le_hypreal_of_real_iff
wenzelm@17423
  2392
  star_of_eq_number <-- hypreal_of_real_eq_number_of_iff
wenzelm@17423
  2393
  star_of_less_number <-- hypreal_of_real_less_number_of_iff
wenzelm@17423
  2394
  star_of_le_number <-- hypreal_of_real_le_number_of_iff
wenzelm@17423
  2395
  star_of_power <-- hypreal_of_real_power
wenzelm@17423
  2396
  star_of_eq_0 <-- hcomplex_of_complex_zero_iff
wenzelm@17423
  2397
huffman@17442
  2398
* Hyperreal: new method "transfer" that implements the transfer
huffman@17442
  2399
principle of nonstandard analysis. With a subgoal that mentions
huffman@17442
  2400
nonstandard types like "'a star", the command "apply transfer"
huffman@17442
  2401
replaces it with an equivalent one that mentions only standard types.
huffman@17442
  2402
To be successful, all free variables must have standard types; non-
huffman@17442
  2403
standard variables must have explicit universal quantifiers.
huffman@17442
  2404
wenzelm@17641
  2405
* Hyperreal: A theory of Taylor series.
wenzelm@17641
  2406
wenzelm@14655
  2407
wenzelm@14682
  2408
*** HOLCF ***
wenzelm@14682
  2409
wenzelm@17533
  2410
* Discontinued special version of 'constdefs' (which used to support
wenzelm@17533
  2411
continuous functions) in favor of the general Pure one with full
wenzelm@17533
  2412
type-inference.
wenzelm@17533
  2413
wenzelm@17533
  2414
* New simplification procedure for solving continuity conditions; it
wenzelm@17533
  2415
is much faster on terms with many nested lambda abstractions (cubic
huffman@17442
  2416
instead of exponential time).
huffman@17442
  2417
wenzelm@17533
  2418
* New syntax for domain package: selector names are now optional.
huffman@17442
  2419
Parentheses should be omitted unless argument is lazy, for example:
huffman@17442
  2420
huffman@17442
  2421
  domain 'a stream = cons "'a" (lazy "'a stream")
huffman@17442
  2422
wenzelm@17533
  2423
* New command 'fixrec' for defining recursive functions with pattern
wenzelm@17533
  2424
matching; defining multiple functions with mutual recursion is also
wenzelm@17533
  2425
supported.  Patterns may include the constants cpair, spair, up, sinl,
wenzelm@17533
  2426
sinr, or any data constructor defined by the domain package. The given
wenzelm@17533
  2427
equations are proven as rewrite rules. See HOLCF/ex/Fixrec_ex.thy for
wenzelm@17533
  2428
syntax and examples.
wenzelm@17533
  2429
wenzelm@17533
  2430
* New commands 'cpodef' and 'pcpodef' for defining predicate subtypes
wenzelm@17533
  2431
of cpo and pcpo types. Syntax is exactly like the 'typedef' command,
wenzelm@17533
  2432
but the proof obligation additionally includes an admissibility
wenzelm@17533
  2433
requirement. The packages generate instances of class cpo or pcpo,
wenzelm@17533
  2434
with continuity and strictness theorems for Rep and Abs.
huffman@17442
  2435
huffman@17584
  2436
* HOLCF: Many theorems have been renamed according to a more standard naming
huffman@17584
  2437
scheme (INCOMPATIBILITY):
huffman@17584
  2438
huffman@17584
  2439
  foo_inject:  "foo$x = foo$y ==> x = y"
huffman@17584
  2440
  foo_eq:      "(foo$x = foo$y) = (x = y)"
huffman@17584
  2441
  foo_less:    "(foo$x << foo$y) = (x << y)"
huffman@17584
  2442
  foo_strict:  "foo$UU = UU"
huffman@17584
  2443
  foo_defined: "... ==> foo$x ~= UU"
huffman@17584
  2444
  foo_defined_iff: "(foo$x = UU) = (x = UU)"
huffman@17584
  2445
wenzelm@14682
  2446
paulson@14885
  2447
*** ZF ***
paulson@14885
  2448
wenzelm@16234
  2449
* ZF/ex: theories Group and Ring provide examples in abstract algebra,
wenzelm@16234
  2450
including the First Isomorphism Theorem (on quotienting by the kernel
wenzelm@16234
  2451
of a homomorphism).
wenzelm@15089
  2452
wenzelm@15089
  2453
* ZF/Simplifier: install second copy of type solver that actually
wenzelm@16234
  2454
makes use of TC rules declared to Isar proof contexts (or locales);
wenzelm@16234
  2455
the old version is still required for ML proof scripts.
wenzelm@15703
  2456
wenzelm@15703
  2457
wenzelm@17445
  2458
*** Cube ***
wenzelm@17445
  2459
wenzelm@17445
  2460
* Converted to Isar theory format; use locales instead of axiomatic
wenzelm@17445
  2461
theories.
wenzelm@17445
  2462
wenzelm@17445
  2463
wenzelm@15703
  2464
*** ML ***
wenzelm@15703
  2465
haftmann@21339
  2466
* Pure/library.ML: added ##>, ##>>, #>> -- higher-order counterparts
haftmann@21339
  2467
for ||>, ||>>, |>>,
haftmann@21339
  2468
wenzelm@15973
  2469
* Pure/library.ML no longer defines its own option datatype, but uses
wenzelm@16234
  2470
that of the SML basis, which has constructors NONE and SOME instead of
wenzelm@16234
  2471
None and Some, as well as exception Option.Option instead of OPTION.
wenzelm@16234
  2472
The functions the, if_none, is_some, is_none have been adapted
wenzelm@16234
  2473
accordingly, while Option.map replaces apsome.
wenzelm@15973
  2474
wenzelm@16860
  2475
* Pure/library.ML: the exception LIST has been given up in favour of
wenzelm@16860
  2476
the standard exceptions Empty and Subscript, as well as
wenzelm@16860
  2477
Library.UnequalLengths.  Function like Library.hd and Library.tl are
wenzelm@16860
  2478
superceded by the standard hd and tl functions etc.
wenzelm@16860
  2479
wenzelm@16860
  2480
A number of basic list functions are no longer exported to the ML
wenzelm@16860
  2481
toplevel, as they are variants of predefined functions.  The following
wenzelm@16234
  2482
suggests how one can translate existing code:
wenzelm@15973
  2483
wenzelm@15973
  2484
    rev_append xs ys = List.revAppend (xs, ys)
wenzelm@15973
  2485
    nth_elem (i, xs) = List.nth (xs, i)
wenzelm@15973
  2486
    last_elem xs = List.last xs
wenzelm@15973
  2487
    flat xss = List.concat xss
wenzelm@16234
  2488
    seq fs = List.app fs
wenzelm@15973
  2489
    partition P xs = List.partition P xs
wenzelm@15973
  2490
    mapfilter f xs = List.mapPartial f xs
wenzelm@15973
  2491
wenzelm@16860
  2492
* Pure/library.ML: several combinators for linear functional
wenzelm@16860
  2493
transformations, notably reverse application and composition:
wenzelm@16860
  2494
wenzelm@17371
  2495
  x |> f                f #> g
wenzelm@17371
  2496
  (x, y) |-> f          f #-> g
wenzelm@16860
  2497
haftmann@17495
  2498
* Pure/library.ML: introduced/changed precedence of infix operators:
haftmann@17495
  2499
haftmann@17495
  2500
  infix 1 |> |-> ||> ||>> |>> |>>> #> #->;
haftmann@17495
  2501
  infix 2 ?;
haftmann@17495
  2502
  infix 3 o oo ooo oooo;
haftmann@17495
  2503
  infix 4 ~~ upto downto;
haftmann@17495
  2504
haftmann@17495
  2505
Maybe INCOMPATIBILITY when any of those is used in conjunction with other
haftmann@17495
  2506
infix operators.
haftmann@17495
  2507
wenzelm@17408
  2508
* Pure/library.ML: natural list combinators fold, fold_rev, and
haftmann@16869
  2509
fold_map support linear functional transformations and nesting.  For
wenzelm@16860
  2510
example:
wenzelm@16860
  2511
wenzelm@16860
  2512
  fold f [x1, ..., xN] y =
wenzelm@16860
  2513
    y |> f x1 |> ... |> f xN
wenzelm@16860
  2514
wenzelm@16860
  2515
  (fold o fold) f [xs1, ..., xsN] y =
wenzelm@16860
  2516
    y |> fold f xs1 |> ... |> fold f xsN
wenzelm@16860
  2517
wenzelm@16860
  2518
  fold f [x1, ..., xN] =
wenzelm@16860
  2519
    f x1 #> ... #> f xN
wenzelm@16860
  2520
wenzelm@16860
  2521
  (fold o fold) f [xs1, ..., xsN] =
wenzelm@16860
  2522
    fold f xs1 #> ... #> fold f xsN
wenzelm@16860
  2523
wenzelm@17408
  2524
* Pure/library.ML: the following selectors on type 'a option are
wenzelm@17408
  2525
available:
wenzelm@17408
  2526
wenzelm@17408
  2527
  the:               'a option -> 'a  (*partial*)
wenzelm@17408
  2528
  these:             'a option -> 'a  where 'a = 'b list
haftmann@17402
  2529
  the_default: 'a -> 'a option -> 'a
haftmann@17402
  2530
  the_list:          'a option -> 'a list
haftmann@17402
  2531
wenzelm@17408
  2532
* Pure/General: structure AList (cf. Pure/General/alist.ML) provides
wenzelm@17408
  2533
basic operations for association lists, following natural argument
haftmann@17564
  2534
order; moreover the explicit equality predicate passed here avoids
haftmann@17495
  2535
potentially expensive polymorphic runtime equality checks.
haftmann@17495
  2536
The old functions may be expressed as follows:
wenzelm@17408
  2537
wenzelm@17408
  2538
  assoc = uncurry (AList.lookup (op =))
wenzelm@17408
  2539
  assocs = these oo AList.lookup (op =)
wenzelm@17408
  2540
  overwrite = uncurry (AList.update (op =)) o swap
wenzelm@17408
  2541
haftmann@17564
  2542
* Pure/General: structure AList (cf. Pure/General/alist.ML) provides
haftmann@17564
  2543
haftmann@17564
  2544
  val make: ('a -> 'b) -> 'a list -> ('a * 'b) list
haftmann@17564
  2545
  val find: ('a * 'b -> bool) -> ('c * 'b) list -> 'a -> 'c list
haftmann@17564
  2546
haftmann@17564
  2547
replacing make_keylist and keyfilter (occassionally used)
haftmann@17564
  2548
Naive rewrites:
haftmann@17564
  2549
haftmann@17564
  2550
  make_keylist = AList.make
haftmann@17564
  2551
  keyfilter = AList.find (op =)
haftmann@17564
  2552
haftmann@17564
  2553
* eq_fst and eq_snd now take explicit equality parameter, thus
haftmann@17564
  2554
  avoiding eqtypes. Naive rewrites:
haftmann@17564
  2555
haftmann@17564
  2556
    eq_fst = eq_fst (op =)
haftmann@17564
  2557
    eq_snd = eq_snd (op =)
haftmann@17564
  2558
haftmann@17564
  2559
* Removed deprecated apl and apr (rarely used).
haftmann@17564
  2560
  Naive rewrites:
haftmann@17564
  2561
haftmann@17564
  2562
    apl (n, op) =>>= curry op n
haftmann@17564
  2563
    apr (op, m) =>>= fn n => op (n, m)
haftmann@17564
  2564
wenzelm@17408
  2565
* Pure/General: structure OrdList (cf. Pure/General/ord_list.ML)
wenzelm@17408
  2566
provides a reasonably efficient light-weight implementation of sets as
wenzelm@17408
  2567
lists.
wenzelm@17408
  2568
wenzelm@17408
  2569
* Pure/General: generic tables (cf. Pure/General/table.ML) provide a
wenzelm@17408
  2570
few new operations; existing lookup and update are now curried to
wenzelm@17408
  2571
follow natural argument order (for use with fold etc.);
wenzelm@17408
  2572
INCOMPATIBILITY, use (uncurry Symtab.lookup) etc. as last resort.
wenzelm@17408
  2573
wenzelm@17408
  2574
* Pure/General: output via the Isabelle channels of
wenzelm@17408
  2575
writeln/warning/error etc. is now passed through Output.output, with a
wenzelm@17408
  2576
hook for arbitrary transformations depending on the print_mode
wenzelm@17408
  2577
(cf. Output.add_mode -- the first active mode that provides a output
wenzelm@17408
  2578
function wins).  Already formatted output may be embedded into further
wenzelm@17408
  2579
text via Output.raw; the result of Pretty.string_of/str_of and derived
wenzelm@17408
  2580
functions (string_of_term/cterm/thm etc.) is already marked raw to
wenzelm@17408
  2581
accommodate easy composition of diagnostic messages etc.  Programmers
wenzelm@17408
  2582
rarely need to care about Output.output or Output.raw at all, with
wenzelm@17408
  2583
some notable exceptions: Output.output is required when bypassing the
wenzelm@17408
  2584
standard channels (writeln etc.), or in token translations to produce
wenzelm@17408
  2585
properly formatted results; Output.raw is required when capturing
wenzelm@17408
  2586
already output material that will eventually be presented to the user
wenzelm@17408
  2587
a second time.  For the default print mode, both Output.output and
wenzelm@17408
  2588
Output.raw have no effect.
wenzelm@17408
  2589
wenzelm@17408
  2590
* Pure/General: Output.time_accumulator NAME creates an operator ('a
wenzelm@17408
  2591
-> 'b) -> 'a -> 'b to measure runtime and count invocations; the
wenzelm@17408
  2592
cumulative results are displayed at the end of a batch session.
wenzelm@17408
  2593
wenzelm@17408
  2594
* Pure/General: File.sysify_path and File.quote_sysify path have been
wenzelm@17408
  2595
replaced by File.platform_path and File.shell_path (with appropriate
wenzelm@17408
  2596
hooks).  This provides a clean interface for unusual systems where the
wenzelm@17408
  2597
internal and external process view of file names are different.
wenzelm@17408
  2598
wenzelm@16689
  2599
* Pure: more efficient orders for basic syntactic entities: added
wenzelm@16689
  2600
fast_string_ord, fast_indexname_ord, fast_term_ord; changed sort_ord
wenzelm@16689
  2601
and typ_ord to use fast_string_ord and fast_indexname_ord (term_ord is
wenzelm@16689
  2602
NOT affected); structures Symtab, Vartab, Typtab, Termtab use the fast
wenzelm@16689
  2603
orders now -- potential INCOMPATIBILITY for code that depends on a
wenzelm@16689
  2604
particular order for Symtab.keys, Symtab.dest, etc. (consider using
wenzelm@16689
  2605