Thu, 10 Oct 2019 15:00:36 +0200 wenzelm clarified modules;
Thu, 10 Oct 2019 14:55:26 +0200 wenzelm tuned whitespace;
Thu, 10 Oct 2019 14:53:48 +0200 wenzelm more accurate treatment of propositions within proof terms, but these are ultimately ignored for performance reasons;
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