Wed, 13 Jan 1999 12:16:34 +0100 nipkow Refined arithmetic.
Wed, 13 Jan 1999 12:08:51 +0100 paulson congruence rules finally use == instead of = and <->
Wed, 13 Jan 1999 12:08:18 +0100 paulson generalized qed_spec_mp code to work for ZF
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