Tue, 06 Jul 1999 21:08:30 +0200 wenzelm added Numeral.thy, Tools/numeral_syntax.ML;
Tue, 06 Jul 1999 21:06:51 +0200 wenzelm removed proof history nesting commands (not useful);
Tue, 06 Jul 1999 21:06:03 +0200 wenzelm improved errors;
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