Tue, 23 Sep 2008 17:28:58 +0200 wenzelm added fold_rev;
Tue, 23 Sep 2008 15:48:55 +0200 wenzelm added del_node, which is more efficient for sparse graphs;
Tue, 23 Sep 2008 15:48:54 +0200 wenzelm IntGraph.del_node;
Tue, 23 Sep 2008 15:48:53 +0200 wenzelm join_results: special case for empty list, works without multithreading;
Tue, 23 Sep 2008 15:48:52 +0200 wenzelm added dest_deriv, removed external type deriv;
Tue, 23 Sep 2008 15:48:51 +0200 wenzelm added conditional add_oracles, keep oracles_of_proof private;
Tue, 23 Sep 2008 15:48:50 +0200 wenzelm Thm.proof_of;
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