Wed, 12 Sep 2018 17:49:57 +0200 nipkow tuned
Wed, 12 Sep 2018 16:12:50 +0200 nipkow tuned "=" syntax declarations; made "~=" uniformly "infix"
Tue, 11 Sep 2018 22:25:00 +0200 nipkow tuned proof
Tue, 11 Sep 2018 18:12:11 +0200 nipkow simplified defns
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