Fri, 22 Jan 2010 17:44:46 +0100 Cezary Kaliszyk Proper alpha equivalence for Sigma calculus.
Thu, 21 Jan 2010 19:52:46 +0100 Cezary Kaliszyk Changed fun_map and rel_map to definitions.
Thu, 21 Jan 2010 12:50:43 +0100 Cezary Kaliszyk Lifted Peter's Sigma lemma with Ex1.
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