Tue, 07 Aug 2007 15:04:35 +0200 wenzelm added more instances;
Tue, 07 Aug 2007 14:49:58 +0200 krauss simplified internal interfaces; cong rules are now handled directly by "context_tree.ML"
Tue, 07 Aug 2007 10:03:25 +0200 haftmann split off Option theory
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