Thu, 31 May 2007 18:16:51 +0200 wenzelm proper loading of ML files;
Thu, 31 May 2007 18:16:50 +0200 wenzelm removed dead code;
Thu, 31 May 2007 18:16:47 +0200 wenzelm tuned header;
Thu, 31 May 2007 18:16:46 +0200 wenzelm doc: exclude isabelle_isar.pdf;
Thu, 31 May 2007 15:23:35 +0200 urbanc tuned the proof
Thu, 31 May 2007 14:47:20 +0200 urbanc introduced symmetric variants of the lemmas for alpha-equivalence
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