Fri, 26 Jul 2019 09:50:23 +0200 wenzelm proper proof_serial;
Fri, 26 Jul 2019 09:50:12 +0200 wenzelm more explicit type proof_serial;
Fri, 26 Jul 2019 09:35:02 +0200 wenzelm defer rew_proof on unnamed PThm node as open_proof operation: significant performance improvement;
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