Fri, 28 Aug 2015 11:09:26 +0200 wenzelm clarified language context, e.g. relevant for symbols;
Fri, 28 Aug 2015 10:50:48 +0200 wenzelm merged;
Wed, 26 Aug 2015 16:34:34 +0200 wenzelm tuned;
Thu, 27 Aug 2015 22:36:09 +0200 blanchet generate proper error instead of exception if goal cannot be atomized
Thu, 27 Aug 2015 21:19:48 +0200 haftmann standardized some occurences of ancient "split" alias
Thu, 27 Aug 2015 13:07:45 +0200 haftmann more lemmas on sorting and multisets (due to Thomas Sewell)
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