Fri, 04 Sep 2015 22:16:54 +0200 wenzelm merged
Fri, 04 Sep 2015 21:40:59 +0200 wenzelm close derivation *before* splitting conjuncts, like Goal.prove_common (see also 757cad5a3fe9) -- potential improvement of performance;
Fri, 04 Sep 2015 19:22:13 +0200 wenzelm modernized name space management -- more uniform qualification;
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