thys/Positions.thy
Sun, 10 Feb 2019 21:53:57 +0000 Christian Urban updated to Isabelle 2018
Mon, 10 Sep 2018 21:41:54 +0100 Christian Urban updated
Wed, 06 Sep 2017 00:52:08 +0100 Christian Urban updated
Sun, 27 Aug 2017 00:03:31 +0300 Christian Urban simplified proof
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