Thu, 29 Apr 2010 18:24:52 +0200 blanchet fix more "undeclared symbol" errors related to SPASS's DFG format
Thu, 29 Apr 2010 17:45:39 +0200 blanchet be more discriminate: some one-line Isar proofs are silly
Thu, 29 Apr 2010 17:39:46 +0200 blanchet one-step Isar proofs are not always pointless
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