Mon, 30 Oct 2017 21:52:31 +0100 blanchet added 'mlex_iff' lemma and simplified proof
Mon, 30 Oct 2017 20:27:25 +0100 wenzelm merged
Mon, 30 Oct 2017 20:26:19 +0100 wenzelm recovered document from 9bfb6978eb80;
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