2007-06-23 nipkow 2007-06-23 tuned and renamed group_eq_simps and ring_eq_simps
2007-06-11 chaieb 2007-06-11 tuned Proof
2007-06-06 chaieb 2007-06-06 New Reflected Presburger added to HOL/ex
2006-11-17 wenzelm 2006-11-17 more robust syntax for definition/abbreviation/notation;
2006-11-08 wenzelm 2006-11-08 moved theories Parity, GCD, Binomial to Library;
2006-06-05 krauss 2006-06-05 Added [simp]-lemmas "in_inv_image" and "in_lex_prod" in the spirit of "in_measure". This simplifies some proofs.
2006-05-27 wenzelm 2006-05-27 tuned;
2006-05-12 nipkow 2006-05-12 added lemma in_measure
2006-01-04 nipkow 2006-01-04 Reversed Larry's option/iff change.
2005-12-21 paulson 2005-12-21 removed or modified some instances of [iff]
2005-09-23 webertj 2005-09-23 some typos in comments fixed
2005-09-14 wenzelm 2005-09-14 tuned headers etc.;
2005-09-14 chaieb 2005-09-14 tactic and the rest eliminated, just the theory....
2005-09-14 chaieb 2005-09-14 The oracle for Presburger has been changer: It is automatically generated form a verified formaliztion of Cooper's Algorithm ex/Reflected_Presburger.thy comm_ring : a reflected Method for proving equalities in a commutative ring