Mon, 02 Mar 2009 19:17:20 +0100 wenzelm preliminary/failed attempt to use the new IsarDocument access model to the prover;
Sun, 08 Mar 2009 23:03:49 +0100 immler ProofDocument without state
Thu, 05 Mar 2009 16:40:49 +0100 immler *very* superficial usage of LinearSet
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