Thu, 25 Sep 2008 20:34:17 +0200 explicit checkpoint for low-level (global) theory operations admits concurrent SkipProof.prove;
wenzelm [Thu, 25 Sep 2008 20:34:17 +0200] rev 28362
explicit checkpoint for low-level (global) theory operations admits concurrent SkipProof.prove; tuned list operations;
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