Wed, 06 Dec 2006 21:18:59 +0100 wenzelm added hidden_polymorphism (from variable.ML);
Wed, 06 Dec 2006 21:18:58 +0100 wenzelm add_abbrevs: moved common parts to consts.ML;
Wed, 06 Dec 2006 21:18:57 +0100 wenzelm abbreviate: improved error handling, return result;
Wed, 06 Dec 2006 21:18:56 +0100 wenzelm export: added explicit term operation;
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