Fri, 18 Nov 2005 07:05:11 +0100 mengj -- removed "check_is_fol" from "make_nnf" so that the NNF procedure doesn't check whether a thm is FOL.
Wed, 16 Nov 2005 19:34:19 +0100 wenzelm tuned document;
Wed, 16 Nov 2005 17:50:35 +0100 wenzelm tuned;
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