2010-07-19 haftmann 2010-07-19 discontinued pretending that abel_cancel is logic-independent; cleaned up junk
2010-02-08 haftmann 2010-02-08 separate library theory for type classes combining lattices with various algebraic structures
2010-02-05 haftmann 2010-02-05 more consistent naming of type classes involving orderings (and lattices) -- c.f. NEWS
2009-09-02 wenzelm 2009-09-02 reorganized Compute theories for HOL-Matrix -- avoiding theory files within main HOL/Tools;
2009-01-28 nipkow 2009-01-28 Replaced group_ and ring_simps by algebra_simps; removed compare_rls - use algebra_simps now
2007-06-23 nipkow 2007-06-23 tuned and renamed group_eq_simps and ring_eq_simps
2006-04-23 obua 2006-04-23 added LP.thy