Mon, 11 Jun 2018 08:15:43 +0200 nipkow added lemma
Sat, 09 Jun 2018 21:52:16 +0200 wenzelm clarified signature: more uniform theory_message (see also d7920eb7de54);
Sat, 09 Jun 2018 13:19:57 +0200 wenzelm tuned -- use existing operation;
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