Sun, 26 Feb 2006 22:25:17 +0100 replaced the lemma at_two by at_different;
urbanc [Sun, 26 Feb 2006 22:25:17 +0100] rev 19140
replaced the lemma at_two by at_different; this lemma now proves EX b. a != b
Sun, 26 Feb 2006 22:24:05 +0100 improved the decision-procedure for permutations;
urbanc [Sun, 26 Feb 2006 22:24:05 +0100] rev 19139
improved the decision-procedure for permutations; now uses a simproc FIXME: the simproc still needs to be adapted for arbitrary atom types
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