Fri, 11 Oct 2019 22:06:49 +0200 wenzelm merged
Fri, 11 Oct 2019 22:01:45 +0200 wenzelm proper ML names;
Fri, 11 Oct 2019 21:51:10 +0200 wenzelm clarified standard_proof_of: prefer expand_proof over somewhat adhoc strip_thm_proof;
Fri, 11 Oct 2019 21:44:39 +0200 wenzelm some treatment of OfClass proofs;
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