2012-03-23 ago proof tidying
2012-03-15 ago replacing ":" by "\<in>"
2012-03-15 ago Rewrote some induction proofs to be structured
2012-03-14 ago structured case and induct rules
2012-03-13 ago Structured proofs concerning the square of an infinite cardinal
2012-03-13 ago More structured proofs about cardinal arithmetic
2012-03-08 ago Structured and calculation-based proofs (with new trans rules!)
2012-03-06 ago Using mathematical notation for <-> and cardinal arithmetic
2012-03-06 ago mathematical symbols instead of ASCII
2011-11-20 ago eliminated obsolete "standard";
2010-09-06 ago more antiquotations;
2009-10-17 ago eliminated hard tabulators, guessing at each author's individual tab-width;
2008-07-10 ago Fixed (harmless) typo in closing *}.
2007-10-07 ago modernized specifications;
2005-06-17 ago migrated theory headers to new format
2004-06-08 ago Groups, Rings and supporting lemmas
2004-04-14 ago use more symbols in HTML output
2003-01-23 ago tidying (by script)
2002-10-01 ago Numerous cosmetic changes, prompted by the new simplifier
2002-07-14 ago improved presentation markup
2002-07-09 ago better document preparation
2002-07-02 ago Tidying and introduction of various new theorems
2002-06-24 ago moving some results around
2002-06-19 ago conversion of Cardinal, CardinalArith
2002-06-16 ago conversion of CardinalArith to Isar script
2002-05-17 ago unsymbolize
2002-05-08 ago new lemmas
2002-01-21 ago lexical tidying
2002-01-16 ago Isar version of AC
2002-01-08 ago Added some simprules proofs.
2001-11-09 ago eliminated old "symbols" syntax, use "xsymbols" instead;
2000-09-15 ago tuned symbols;
2000-08-24 ago added some xsymbols, and tidied
2000-08-18 ago X-symbols for ordinal, cardinal, integer arithmetic
2000-08-07 ago instantiated Cancel_Numerals for "nat" in ZF
1996-02-06 ago expanded tabs
1995-12-09 ago removed quotes from consts and syntax sections
1995-06-22 ago removed \...\ inside strings
1995-05-03 ago Changed some definitions and proofs to use pattern-matching.
1994-12-23 ago csquare_rel_def: renamed k to K
1994-11-29 ago replaced "rules" by "defs"
1994-08-12 ago installation of new inductive/datatype sections
1994-07-26 ago Axiom of choice, cardinality results, etc.
1994-07-12 ago new cardinal arithmetic developments
1994-06-23 ago modifications for cardinal arithmetic