Thu, 27 Feb 2020 12:18:16 +0100 removed dead lemma
nipkow [Thu, 27 Feb 2020 12:18:16 +0100] rev 71487
removed dead lemma
Wed, 26 Feb 2020 23:49:16 +0100 simplified proofs
nipkow [Wed, 26 Feb 2020 23:49:16 +0100] rev 71486
simplified proofs
Wed, 26 Feb 2020 19:50:04 +0100 updated for release;
wenzelm [Wed, 26 Feb 2020 19:50:04 +0100] rev 71485
updated for release;
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