Mon, 08 Jun 2015 00:25:10 +0100 paulson Tidied lots of messy proofs
Sun, 07 Jun 2015 23:37:32 +0200 wenzelm tuned signature;
Sun, 07 Jun 2015 22:04:50 +0200 wenzelm tuned (see also 66e6c539a36d);
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