Wed, 07 Nov 2001 18:12:12 +0100 paulson Sidi Ehmety's port of the fold_set operator and multisets to ZF.
Wed, 07 Nov 2001 12:29:07 +0100 paulson reorganization of the ZF examples
Wed, 07 Nov 2001 00:16:19 +0100 wenzelm tuned;
Tue, 06 Nov 2001 23:56:14 +0100 wenzelm cert_def: proper check of args, improved msgs;
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