Thu, 26 Nov 1998 12:18:51 +0100 nipkow Added a general refutation tactic which works by putting things into nnf first.
Thu, 26 Nov 1998 12:18:08 +0100 nipkow Added filter_prems_tac
Wed, 25 Nov 1998 20:55:25 +0100 wenzelm removed prs / prs_fn;
Wed, 25 Nov 1998 15:55:00 +0100 paulson guarantees laws
Wed, 25 Nov 1998 15:54:41 +0100 paulson simplified ensures_UNIV
Wed, 25 Nov 1998 15:53:31 +0100 paulson new thms for invariant
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