Thu, 31 May 2007 15:23:35 +0200 tuned the proof
urbanc [Thu, 31 May 2007 15:23:35 +0200] rev 23159
tuned the proof
Thu, 31 May 2007 14:47:20 +0200 introduced symmetric variants of the lemmas for alpha-equivalence
urbanc [Thu, 31 May 2007 14:47:20 +0200] rev 23158
introduced symmetric variants of the lemmas for alpha-equivalence
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