1995-04-25 lcp [Tue, 25 Apr 1995 11:14:03 +0200] rev 1072 Isabelle94-3
updated version

1995-04-25 lcp [Tue, 25 Apr 1995 11:06:52 +0200] rev 1071
Simple updates for compatibility with KG
src/ZF/AC/AC_Equiv.ML src/ZF/AC/AC_Equiv.thy src/ZF/AC/ROOT.ML src/ZF/AC/WO6_WO1.ML

1995-04-25 lcp [Tue, 25 Apr 1995 11:01:57 +0200] rev 1070
Simplified, removing needless theorems about lambda.

1995-04-25 lcp [Tue, 25 Apr 1995 10:56:49 +0200] rev 1069
Now loads the theory "Let". Could add it to FOL, but this appears to
be incompatible with CCL.

1995-04-22 nipkow [Sat, 22 Apr 1995 13:25:31 +0200] rev 1068

"@" 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

let now allows pttrn (let (x,y) = t in u) instead of just idt (let x = t in u)


UN, INT, ALL, EX, etc all use "pttrn" instead of idt. Same change as for "@"
above, except that "@" was a "binder" originally.


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

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
src/HOL/HOL.thy src/HOL/Prod.thy src/HOL/Set.thy src/HOL/Univ.thy

1995-04-22 nipkow [Sat, 22 Apr 1995 12:21:41 +0200] rev 1067
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.

1995-04-19 nipkow [Wed, 19 Apr 1995 19:15:29 +0200] rev 1066
Simplified proofs thanks to addss.

1995-04-16 nipkow [Sun, 16 Apr 1995 11:59:44 +0200] rev 1065
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.

1995-04-16 nipkow [Sun, 16 Apr 1995 11:56:11 +0200] rev 1064
Fixed bug.

1995-04-16 nipkow [Sun, 16 Apr 1995 11:55:03 +0200] rev 1063
Brought in line with new organization of IOA.