2007-10-07 ago modernized specifications;
2005-06-17 ago migrated theory headers to new format
2003-02-19 ago fixed anomalies in the installed classical rules
2002-07-14 ago improved presentation markup
2002-06-28 ago new theorems, tidying
2002-06-23 ago conversion of Sum, pair to Isar script
2002-06-18 ago tidying
1998-08-17 ago Yet more removal of "goal" commands, especially "goal ZF.thy", so ZF.thy
1997-10-20 ago local;
1997-10-17 ago global;
1997-01-03 ago Implicit simpsets and clasets for FOL and ZF
1996-02-06 ago expanded tabs
1995-12-09 ago removed quotes from consts and syntax sections
1995-05-04 ago case is defined using pattern-matching
1994-11-29 ago replaced "rules" by "defs"
1993-11-16 ago made pseudo theories for all ML files;
1993-09-16 ago Initial revision