src/ZF/Sum.thy
1995-05-04 lcp 1995-05-04 case is defined using pattern-matching
1994-11-29 lcp 1994-11-29 replaced "rules" by "defs"
1993-11-16 clasohm 1993-11-16 made pseudo theories for all ML files; documented dependencies between all thy and ML files
1993-09-16 clasohm 1993-09-16 Initial revision