Wed, 21 Jul 1999 15:17:54 +0200 paulson a more robust proof
Wed, 21 Jul 1999 15:17:30 +0200 paulson tweaked proof after removal of diff_is_0_eq RS iffD2
Wed, 21 Jul 1999 15:16:32 +0200 paulson better error message for curried recdefs, etc.
Wed, 21 Jul 1999 11:34:59 +0200 nipkow Mod by Norber Voelcker
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