Fri, 12 Apr 2019 22:52:00 +0200 avoid Isabelle symbols in URL;
wenzelm [Fri, 12 Apr 2019 22:52:00 +0200] rev 70139
avoid Isabelle symbols in URL;
Fri, 12 Apr 2019 22:24:57 +0200 formal URLs;
wenzelm [Fri, 12 Apr 2019 22:24:57 +0200] rev 70138
formal URLs;
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