Sat, 26 Sep 2020 18:59:12 +0200 added lemma
nipkow [Sat, 26 Sep 2020 18:59:12 +0200] rev 72313
added lemma
Sat, 26 Sep 2020 17:04:51 +0200 less bulky session stack;
wenzelm [Sat, 26 Sep 2020 17:04:51 +0200] rev 72312
less bulky session stack;
Sat, 26 Sep 2020 16:02:54 +0200 clarified document export;
wenzelm [Sat, 26 Sep 2020 16:02:54 +0200] rev 72311
clarified document export;
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