Sat, 23 Nov 2019 11:45:02 +0100 wenzelm tuned proofs;
Sat, 23 Nov 2019 11:36:42 +0100 wenzelm clarified error: tmp file can be invalid in odd situations;
Sat, 23 Nov 2019 11:28:15 +0100 wenzelm more robust: file length can be invalid in odd situations;
Sat, 23 Nov 2019 11:19:18 +0100 wenzelm tuned;
Fri, 22 Nov 2019 15:26:08 +0100 haftmann tuned whitespace
Fri, 22 Nov 2019 09:25:01 +0000 haftmann proper prefix syntax
Fri, 22 Nov 2019 09:24:54 +0000 haftmann removed unused auxiliary lemmas
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