Isabelle NEWS -- history user-relevant changes ============================================== New in this Isabelle release ---------------------------- *** General *** * Provers/order.ML: new efficient reasoner for partial and linear orders. Replaces linorder.ML. * Pure: Greek letters (except small lambda, \), as well as gothic (\...\\...\), calligraphic (\...\), and euler (\...\), are now considered normal letters, and can therefore be used anywhere where an ASCII letter (a...zA...Z) has until now. COMPATIBILITY: This obviously changes the parsing of some terms, especially where a symbol has been used as a binder, say '\x. ...', which is now a type error since \x will be parsed as an identifier. Fix it by inserting a space around former symbols. Call 'isatool fixgreek' to try to fix parsing errors in existing theory and ML files. * Pure: Macintosh and Windows line-breaks are now allowed in theory files. * Pure: single letter sub/superscripts (\<^isub> and \<^isup>) are now allowed in identifiers. Similar to greek letters \<^isub> is now considered a normal (but invisible) letter. For multiple letter subscripts repeat \<^isub> like this: x\<^isub>1\<^isub>2. * Pure: There are now sub-/superscripts that can span more than one character. Text between \<^bsub> and \<^esub> is set in subscript in PG and LaTeX, text between \<^bsup> and \<^esup> in superscript. The new control characters are not identifier parts. * Pure: Control-symbols of the form \<^raw:...> will literally print the content of ... to the latex file instead of \isacntrl... . The ... accepts all printable characters excluding the end bracket >. * Pure: Using new Isar command "finalconsts" (or the ML functions Theory.add_finals or Theory.add_finals_i) it is now possible to declare constants "final", which prevents their being given a definition later. It is useful for constants whose behaviour is fixed axiomatically rather than definitionally, such as the meta-logic connectives. * Pure: It is now illegal to specify Theory.ML explicitly as a dependency in the files section of the theory Theory. (This is more of a diagnostic than a restriction, as the theory loader screws up if Theory.ML is manually loaded.) * Presentation: generated HTML now uses a CSS style sheet to make layout (somewhat) independet of content. It is copied from lib/html/isabelle.css. It can be changed to alter the colors/layout of generated pages. *** Isar *** * Tactic emulation methods rule_tac, erule_tac, drule_tac, frule_tac, cut_tac, subgoal_tac and thin_tac: - Now understand static (Isar) contexts. As a consequence, users of Isar locales are no longer forced to write Isar proof scripts. For details see Isar Reference Manual, paragraph 4.3.2: Further tactic emulations. - INCOMPATIBILITY: names of variables to be instantiated may no longer be enclosed in quotes. Instead, precede variable name with `?'. This is consistent with the instantiation attribute "where". * Attributes "where" and "of": - Now take type variables of instantiated theorem into account when reading the instantiation string. This fixes a bug that caused instantiated theorems to have too special types in some circumstances. - "where" permits explicit instantiations of type variables. * Calculation commands "moreover" and "also" no longer interfere with current facts ("this"), admitting arbitrary combinations with "then" and derived forms. * Locales: - Goal statements involving the context element "includes" no longer generate theorems with internal delta predicates (those ending on "_axioms") in the premise. Resolve particular premise with .intro to obtain old form. - Fixed bug in type inference ("unify_frozen") that prevented mix of target specification and "includes" elements in goal statement. - Rule sets .intro and .axioms no longer declared as [intro?] and [elim?] (respectively) by default. - Experimental command for instantiation of locales in proof contexts: instantiate