isabelle: Changelog

Simple updates for compatibility with KG

Simplified, removing needless theorems about lambda.

Now loads the theory "Let". Could add it to FOL, but this appears to be incompatible with CCL.

HOL.thy: "@" is no longer introduced as a "binder" but has its own explicit translation rule "@x.b" == "Eps(%x.b)". If x is a proper pattern, further translation rules for abstractions with patterns take care of the rest. This is very modular and avoids problems with "binders" such as "!" mentioned below. let now allows pttrn (let (x,y) = t in u) instead of just idt (let x = t in u) Set.thy: UN, INT, ALL, EX, etc all use "pttrn" instead of idt. Same change as for "@" above, except that "@" was a "binder" originally. Prod.thy: Added new syntax for pttrn which allows arbitrarily nested tuples. Two translation rules take care of %pttrn. Unfortunately they cannot be reversed. Hence a little ML-code is used as well. Note that now "! (x,y). ..." is syntactically valid but leads to a translation error. This is because "!" is introduced as a "binder" which means that its translation into lambda-terms is not done by a rewrite rule (aka macro) but by some fixed ML-code which comes after the rewriting stage and does not know how to handle patterns. This looks like a minor blemish since patterns in unbounded quantifiers are not that useful (well, except maybe in unique existence ...). Ideally, there should be two syntactic categories: idts, as we know and love it, which does not admit patterns. patterns, which is what idts has become now. There is one more point where patterns are now allowed but don't make sense: {e | idts . P} where idts is the list of local variables. Univ.thy: converted the defs for <++> and <**> into pattern form. It worked perfectly.

I have modified the grammar for idts (sequences of identifiers with optional type annotations). idts are generally used as in abstractions, be it lambda-abstraction or quantifiers. It now has roughly the form idts = pttrn* pttrn = idt where pttrn is a new nonterminal (type) not used anywhere else. This means that the Pure syntax for idts is in fact unchanged. The point is that the new nontermianl pttrn allows later extensions of this syntax. (See, for example, HOL/Prod.thy). The name idts is not quite accurate any longer and may become downright confusing once pttrn has been extended. Something should be done about this, in particular wrt to the manual.

Simplified proofs thanks to addss.

Fixed old bug in the simplifier. Term to be simplified now carries around its maxidx. Needed for renaming rewrite or congruence rules. maxidx should be ~1 in most cases (ie no Vars), hence reasonable overhead.

Brought in line with new organization of IOA.

New examples directories Resid and AC

Definition of 'let' declarations, from HOL

In binders, the default body priority is now p instead of 0.

Now builds Resid as a test

Renamed diff_sing_lepoll to Diff_sing_lepoll.

Renamed domain_diff_subset, range_diff_subset, field_diff_subset, converse_diff to domain_Diff_subset, range_Diff_subset, field_Diff_subset, converse_Diff for consistency. (Thanks to KG)

Renamed diff_sing_lepoll, lepoll_diff_sing and diff_sing_eqpoll to Diff_sing_lepoll, lepoll_Diff_sing and Diff_sing_eqpoll for consistency. Strengthened lepoll_Diff_sing. (Thanks to KG)

Updated CADE reference

Removes (obsolete) target if already present.

Directory example is now called NTP

ABP: Alternating bit protocol example

New example by Ole Rasmussen

Simplified some proofs and made them work for new hyp_subst_tac.

Deleted some useless things and made proofs of refl_comp_subset and comp_equivI more like the versions in ZF/EquivClass.ML

Simplified using pattern replacements.

adjusted HOLCF for new hyp_subst_tac