| Wed, 25 May 1994 13:03:19 +0200 | lcp | HOL/Arith: definition of diff now uses pred, not nat_rec | file | diff | annotate |
| Tue, 30 Nov 1993 17:44:04 +0100 | nipkow | added pred: nat=>nat | file | diff | annotate |
| Thu, 16 Sep 1993 12:21:07 +0200 | clasohm | Initial revision | file | diff | annotate |