Mon, 16 Sep 2019 23:20:45 +0200 wenzelm clarified inversion of file name to theory name, notably for Windows;
Mon, 16 Sep 2019 21:42:22 +0200 wenzelm clarified import_name: observe directory notation more strictly;
Mon, 16 Sep 2019 21:30:30 +0200 wenzelm tuned signature;
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