Mon, 28 Jan 2019 18:36:50 -0500 immler less odd class.second_countable_topology_def
Mon, 28 Jan 2019 20:32:09 +0100 wenzelm revert accident with raw Unicode (not Isabelle symbols) in 7404f5b91e56;
Mon, 28 Jan 2019 16:29:11 +0100 nipkow changed precedence of big operators: now like any other function symbol
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