Fri, 28 Feb 2020 16:40:28 +0100 wenzelm tuned;
Thu, 27 Feb 2020 13:27:49 +0100 wenzelm more complete signature;
Thu, 27 Feb 2020 12:58:03 +0100 wenzelm more complete signature;
Thu, 27 Feb 2020 12:27:49 +0100 wenzelm clarified versions -- more reproducible build;
Thu, 27 Feb 2020 12:18:16 +0100 nipkow removed dead lemma
Wed, 26 Feb 2020 23:49:16 +0100 nipkow simplified proofs
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