Tue, 30 Jul 2019 11:51:55 +0200 wenzelm clarified context;
Tue, 30 Jul 2019 11:41:39 +0200 wenzelm clarified modules;
Tue, 30 Jul 2019 11:12:52 +0200 wenzelm discontinue clean_proof: without type args its PThm nodes are not expanded, but with type args it is too unstable;
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