Fri, 29 Dec 2006 18:46:06 +0100 wenzelm tuned;
Fri, 29 Dec 2006 18:46:04 +0100 wenzelm signed_string_of_int;
Fri, 29 Dec 2006 18:46:04 +0100 wenzelm added proper header;
Fri, 29 Dec 2006 18:46:02 +0100 wenzelm added signed_string_of_int (pruduces proper - instead of SML's ~);
Fri, 29 Dec 2006 18:46:01 +0100 wenzelm removed obsolete proof_general.ML;
Fri, 29 Dec 2006 18:25:46 +0100 wenzelm minor tuning;
Fri, 29 Dec 2006 18:25:45 +0100 wenzelm tuned specifications/proofs;
Fri, 29 Dec 2006 17:24:49 +0100 wenzelm replaced Sign.classes by Sign.all_classes (topologically sorted);
Fri, 29 Dec 2006 17:24:49 +0100 wenzelm renamed Graph.project to Graph.subgraph;
Fri, 29 Dec 2006 17:24:47 +0100 wenzelm replaced Sign.classes by Sign.all_classes (topologically sorted);
Fri, 29 Dec 2006 17:24:46 +0100 wenzelm renamed project to subgraph, improved presentation, avoided unnecessary evaluation of predicate;
Fri, 29 Dec 2006 17:24:45 +0100 wenzelm Sorts.minimal_classes;
Fri, 29 Dec 2006 17:24:44 +0100 wenzelm classes: more direct way to achieve topological sorting;
Fri, 29 Dec 2006 17:24:43 +0100 wenzelm replaced classes by all_classes (topologically sorted);
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