2010-02-08 haftmann 2010-02-08 renamed OrderedGroup to Groups; split theory Ring_and_Field into Rings Fields
2010-02-05 haftmann 2010-02-05 more consistent naming of type classes involving orderings (and lattices) -- c.f. NEWS
2009-10-17 wenzelm 2009-10-17 eliminated hard tabulators, guessing at each author's individual tab-width; tuned headers;
2009-07-21 haftmann 2009-07-21 swapped bootstrap order of UNION/Union and INTER/Inter in theory Set
2009-02-06 chaieb 2009-02-06 fixed Proofs and dependencies ; Theory Dense_Linear_Order moved to Library
2009-01-28 nipkow 2009-01-28 Replaced group_ and ring_simps by algebra_simps; removed compare_rls - use algebra_simps now
2008-12-29 haftmann 2008-12-29 adapted HOL source structure to distribution layout
2008-12-03 haftmann 2008-12-03 made repository layout more coherent with logical distribution structure; stripped some $Id$s