Mon, 30 Nov 2015 15:23:02 +0100 wenzelm misc tuning and modernization;
Mon, 30 Nov 2015 14:24:51 +0100 wenzelm tuned;
Mon, 30 Nov 2015 13:16:12 +0100 blanchet avoid 'hence' and 'thus' in generated proofs
Mon, 30 Nov 2015 13:14:56 +0100 blanchet removed tracing
Sun, 29 Nov 2015 19:01:54 +0100 nipkow RBT invariants for insert
Sat, 28 Nov 2015 23:59:08 +0100 wenzelm removed junk;
Fri, 27 Nov 2015 19:00:27 +0100 wenzelm merged
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