2009-10-17 wenzelm 2009-10-17 eliminated hard tabulators, guessing at each author's individual tab-width; tuned headers;
2006-11-17 wenzelm 2006-11-17 more robust syntax for definition/abbreviation/notation;
2006-11-07 wenzelm 2006-11-07 tuned specifications;
2005-06-17 haftmann 2005-06-17 migrated theory headers to new format
2003-08-28 skalberg 2003-08-28 Extended the notion of letter and digit, such that now one may use greek, gothic, euler, or calligraphic letters as normal letters.
2002-10-09 paulson 2002-10-09 Re-organization of Constructible theories
2002-08-16 paulson 2002-08-16 Relativized right up to L satisfies V=L!
2002-07-29 wenzelm 2002-07-29 eliminate open locales and special ML code;
2002-07-16 wenzelm 2002-07-16 adapted locales;
2002-07-01 paulson 2002-07-01 more use of relativized quantifiers list_closed
2002-06-19 paulson 2002-06-19 new theory of inner models