Sun, 03 Nov 2019 20:38:08 +0100 wenzelm expose derivations more thoroughly, notably for locale/class reasoning;
Sun, 03 Nov 2019 19:43:59 +0100 wenzelm clarified errors;
Sun, 03 Nov 2019 18:55:35 +0100 wenzelm determine proof boxes from exported proof (NB: thm_boxes is not sufficient due to OfClass proofs);
Sun, 03 Nov 2019 18:53:48 +0100 wenzelm more operations;
Sun, 03 Nov 2019 16:20:05 +0100 wenzelm tuned whitespace;
Sun, 03 Nov 2019 16:01:39 +0100 wenzelm more robust;
Sun, 03 Nov 2019 15:48:59 +0100 wenzelm clarified modules;
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