Fri, 22 May 2020 15:53:47 +0200 wenzelm clarified signature;
Fri, 22 May 2020 13:53:19 +0200 wenzelm unused;
Fri, 22 May 2020 12:18:09 +0200 wenzelm more robust, notably for "isabelle scala";
Fri, 22 May 2020 11:30:06 +0200 wenzelm clarified signature;
Sun, 24 May 2020 09:04:25 +0200 nipkow reorganised sorted_set_of_list
Sun, 24 May 2020 08:20:23 +0200 nipkow merged
Sun, 24 May 2020 08:20:05 +0200 nipkow simpler inductions
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