Mon, 12 Aug 2019 15:57:40 +0200 nipkow simplified defs (thanks to Mohammad)
Sun, 11 Aug 2019 22:36:34 +0200 wenzelm record sort constraints unconditionally: minimal performance implications;
Sat, 10 Aug 2019 17:09:20 +0200 wenzelm more careful export of unnamed proof boxes: avoid duplicates via memoing;
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