Wed, 09 Oct 2019 22:22:17 +0200 wenzelm tuned;
Wed, 09 Oct 2019 22:18:23 +0200 wenzelm tuned -- allow slightly more expensive atomic proofs;
Wed, 09 Oct 2019 21:59:56 +0200 wenzelm clarified signature -- some operations to support fully explicit proof terms;
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