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.

Fixed bug.

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

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