Tue, 07 Jun 2016 20:45:07 +0200 wenzelm less ambitious arguments: thms only, no context declaration;
Tue, 07 Jun 2016 19:59:42 +0200 wenzelm added method operator "use";
Tue, 07 Jun 2016 19:57:41 +0200 wenzelm clarified signature;
Tue, 07 Jun 2016 19:55:45 +0200 wenzelm clean facts more uniformly;
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