Mon, 19 Feb 2018 10:35:53 +0100 clarified modules;
wenzelm [Mon, 19 Feb 2018 10:35:53 +0100] rev 67658
clarified modules;
Mon, 19 Feb 2018 10:05:37 +0100 more operations;
wenzelm [Mon, 19 Feb 2018 10:05:37 +0100] rev 67657
more operations;
Mon, 19 Feb 2018 13:56:16 +0100 added lemma
nipkow [Mon, 19 Feb 2018 13:56:16 +0100] rev 67656
added lemma
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