Fri, 20 Feb 1998 17:56:51 +0100 nipkow Congruence rules use == in premises now.
Fri, 20 Feb 1998 17:56:39 +0100 nipkow Congruence rules use == in premises now.
Fri, 20 Feb 1998 17:33:14 +0100 oheimb minor improvements
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