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NEWS

author | wenzelm |

Fri, 28 Feb 1997 16:54:32 +0100 | |

changeset 2702 | 4167688e58aa |

parent 2654 | 6efa602921d1 |

child 2705 | d6e83a02061d |

permissions | -rw-r--r-- |

now uses -m symbols;

Isabelle NEWS -- history of user-visible changes ================================================ New in Isabelle94-8 (really-soon-now 1997 FIXME) ------------------------------------------------ * HOLCF changes: derived all rules and arities + axiomatic type classes instead of classes + typedef instead of faking type definitions + eliminated the initernal constants less_fun, less_cfun, UU_fun, UU_cfun etc. + new axclasses cpo,chfin,flat with flat<chfin<pcpo<cpo<po + eliminated the types void, one, tr + use unit lift and bool lift (with translations) instead of one and tr + eliminated blift from Lift3.thy (use Def instead of blift) all eliminated rules are derivd as theorems --> no visible changes * simplifier: new functions delcongs, deleqcongs, and Delcongs. richer rep_ss. * simplifier: the solver is now split into a safe and an unsafe part. This should be invisible for the normal user, except that the functions setsolver and addsolver have been renamed to setSolver and addSolver. added safe_asm_full_simp_tac. * classical reasoner: little changes in semantics of addafter (now: addaltern), renamed setwrapper to setWrapper, addwrapper to addWrapper added safe wrapper (and access functions for it) * improved combination of classical reasoner and simplifier: new addss, auto_tac, functions for handling clasimpsets, ... Now, the simplification is safe (therefore moved to safe_step_tac) and thus more complete, as multiple instantiation of unknowns (with slow_tac) possible COULD MAKE EXISTING PROOFS FAIL; in case of problems with unstable old proofs: use unsafe_addss and unsafe_auto_tac * HOL: primrec now also works with type nat; * new utilities to build / run / maintain Isabelle etc. (in parts still somewhat experimental); old Makefiles etc. still functional; * simplifier: termless order as parameter; added interface for simplification procedures (functions that produce *proven* rewrite rules on the fly, depending on current redex); * now supports alternative (named) syntax tables (parser and pretty printer); internal interface is provided by add_modesyntax(_i); * Pure, FOL, ZF, HOL, HOLCF now support symbolic input and output; to be used in conjunction with the isabelle symbol font; uses the "symbols" syntax table; * infixes may now be declared with names independent of their syntax; * added typed_print_translation (like print_translation, but may access type of constant); * prlim command for dealing with lots of subgoals (an easier way of setting goals_limit); * HOL/ex/Ring.thy declares cring_simp, which solves equational problems in commutative rings, using axiomatic type classes for + and *; * ZF now has Fast_tac, Simp_tac and Auto_tac. WARNING: don't use ZF.thy anymore! Contains fewer defs and could make a bogus simpset. Beware of Union_iff. eq_cs is gone, can be put back as ZF_cs addSIs [equalityI]; * more examples in HOL/MiniML and HOL/Auth; * more default rewrite rules in HOL for quantifiers, union/intersection; * the NEWS file; New in Isabelle94-7 (November 96) --------------------------------- * allowing negative levels (as offsets) in prlev and choplev; * super-linear speedup for large simplifications; * FOL, ZF and HOL now use miniscoping: rewriting pushes quantifications in as far as possible (COULD MAKE EXISTING PROOFS FAIL); can suppress it using the command Delsimps (ex_simps @ all_simps); De Morgan laws are also now included, by default; * improved printing of ==> : ~: * new object-logic "Sequents" adds linear logic, while replacing LK and Modal (thanks to Sara Kalvala); * HOL/Auth: correctness proofs for authentication protocols; * HOL: new auto_tac combines rewriting and classical reasoning (many examples on HOL/Auth); * HOL: new command AddIffs for declaring theorems of the form P=Q to the rewriter and classical reasoner simultaneously; * function uresult no longer returns theorems in "standard" format; regain previous version by: val uresult = standard o uresult; New in Isabelle94-6 ------------------- * oracles -- these establish an interface between Isabelle and trusted external reasoners, which may deliver results as theorems; * proof objects (in particular record all uses of oracles); * Simp_tac, Fast_tac, etc. that refer to implicit simpset / claset; * "constdefs" section in theory files; * "primrec" section (HOL) no longer requires names; * internal type "tactic" now simply "thm -> thm Sequence.seq"; New in Isabelle94-5 ------------------- * reduced space requirements; * automatic HTML generation from theories; * theory files no longer require "..." (quotes) around most types; * new examples, including two proofs of the Church-Rosser theorem; * non-curried (1994) version of HOL is no longer distributed; New in Isabelle94-4 ------------------- * greatly space requirements; * theory files (.thy) no longer require \...\ escapes at line breaks; * searchable theorem database (see the section "Retrieving theorems" on page 8 of the Reference Manual); * new examples, including Grabczewski's monumental case study of the Axiom of Choice; * The previous version of HOL renamed to Old_HOL; * The new version of HOL (previously called CHOL) uses a curried syntax for functions. Application looks like f a b instead of f(a,b); * Mutually recursive inductive definitions finally work in HOL; * In ZF, pattern-matching on tuples is now available in all abstractions and translates to the operator "split"; New in Isabelle94-3 ------------------- * new infix operator, addss, allowing the classical reasoner to perform simplification at each step of its search. Example: fast_tac (cs addss ss) * a new logic, CHOL, the same as HOL, but with a curried syntax for functions. Application looks like f a b instead of f(a,b). Also pairs look like (a,b) instead of <a,b>; * PLEASE NOTE: CHOL will eventually replace HOL! * In CHOL, pattern-matching on tuples is now available in all abstractions. It translates to the operator "split". A new theory of integers is available; * In ZF, integer numerals now denote two's-complement binary integers. Arithmetic operations can be performed by rewriting. See ZF/ex/Bin.ML; * Many new examples: I/O automata, Church-Rosser theorem, equivalents of the Axiom of Choice; New in Isabelle94-2 ------------------- * Significantly faster resolution; * the different sections in a .thy file can now be mixed and repeated freely; * Database of theorems for FOL, HOL and ZF. New commands including qed, qed_goal and bind_thm store theorems in the database. * Simple database queries: return a named theorem (get_thm) or all theorems of a given theory (thms_of), or find out what theory a theorem was proved in (theory_of_thm); * Bugs fixed in the inductive definition and datatype packages; * The classical reasoner provides deepen_tac and depth_tac, making FOL_dup_cs and HOL_dup_cs obsolete; * Syntactic ambiguities caused by the new treatment of syntax in Isabelle94-1 have been removed; * Simpler definition of function space in ZF; * new results about cardinal and ordinal arithmetic in ZF; * 'subtype' facility in HOL for introducing new types as subsets of existing types; $Id$