Tue, 31 Oct 2017 15:15:02 +0100 wenzelm more permissive: db could be empty after hard crash;
Tue, 31 Oct 2017 15:13:08 +0100 wenzelm no censorship (in contrast to 2c828c830ad7);
Tue, 31 Oct 2017 13:59:19 +0000 paulson A few more topological results. And made some slow proofs faster
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