Sun, 07 Jan 2018 12:41:34 +0100 wenzelm tuned;
Sat, 06 Jan 2018 21:25:16 +0100 wenzelm clarified signature;
Sat, 06 Jan 2018 21:05:51 +0100 wenzelm clarified modules;
Sat, 06 Jan 2018 16:56:07 +0100 wenzelm inner syntax comments may be written as "\<comment> \<open>text\<close>";
Sun, 07 Jan 2018 11:12:34 +0100 haftmann spelling
Sat, 06 Jan 2018 22:55:52 +0100 nipkow corrected op
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