Wed, 07 Sep 2011 17:03:34 +0200 clarified import;
wenzelm [Wed, 07 Sep 2011 17:03:34 +0200] rev 44781
clarified import;
Wed, 07 Sep 2011 16:53:49 +0200 tuned/simplified proofs;
wenzelm [Wed, 07 Sep 2011 16:53:49 +0200] rev 44780
tuned/simplified proofs;
Wed, 07 Sep 2011 16:37:50 +0200 tuned proofs;
wenzelm [Wed, 07 Sep 2011 16:37:50 +0200] rev 44779
tuned proofs;
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