Mon, 14 Jul 2008 11:19:39 +0200 wenzelm removed obsolete history commands;
Mon, 14 Jul 2008 11:19:38 +0200 wenzelm Proof nodes with linear position and backtracking (replaces obsolete proof_history.ML).
Mon, 14 Jul 2008 11:19:37 +0200 wenzelm obsolete (cf. proof_node.ML);
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