Wed, 01 Apr 2020 21:48:39 +0200 nipkow simplified code and proofs
Wed, 01 Apr 2020 18:05:02 +0200 nipkow automated proof
Tue, 31 Mar 2020 17:26:54 +0200 nipkow merged
Tue, 31 Mar 2020 15:51:15 +0200 nipkow cleaned proofs
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