Thu, 17 Oct 2019 20:56:09 +0200 wenzelm proper Thm.transfer;
Thu, 17 Oct 2019 20:28:31 +0200 wenzelm clarified files;
Thu, 17 Oct 2019 17:24:13 +0200 wenzelm clarified proof_boxes (requires prune_proofs=false);
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