Tue, 27 Apr 2010 14:41:27 +0200 wenzelm clarified proven results: store thm only and retrieve proof later via Thm.proof_of (this may also impact parallelism, because internal join_proofs is deferred);
Tue, 27 Apr 2010 14:19:47 +0200 wenzelm misc tuning and simplification;
Tue, 27 Apr 2010 10:42:41 +0200 haftmann NEWS and CONTRIBUTORS
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