Fri, 06 Sep 2013 20:59:36 +0200 haftmann slight cleanup of lemma locations; tuned proof
Fri, 06 Sep 2013 20:55:14 +0200 haftmann tuned
Fri, 06 Sep 2013 15:47:51 +0200 wenzelm tuned;
Fri, 06 Sep 2013 12:46:50 +0200 wenzelm tuned;
Fri, 06 Sep 2013 12:22:00 +0200 wenzelm removed junk;
Fri, 06 Sep 2013 12:05:01 +0200 wenzelm more standard header;
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