src/HOL/Library/Abstract_Rat.thy
2009-01-28 nipkow 2009-01-28 Replaced group_ and ring_simps by algebra_simps; removed compare_rls - use algebra_simps now
2008-10-16 wenzelm 2008-10-16 explicit SORT_CONSTRAINT for proofs depending implicitly on certain sorts;
2008-07-21 chaieb 2008-07-21 Tuned and simplified proofs
2008-07-14 chaieb 2008-07-14 Fixed proofs.
2008-07-14 haftmann 2008-07-14 unified curried gcd, lcm, zgcd, zlcm
2008-06-26 haftmann 2008-06-26 established Plain theory and image
2008-04-02 haftmann 2008-04-02 dropped wrong code lemma
2007-10-12 wenzelm 2007-10-12 replaced syntax/translations by abbreviation;
2007-08-09 haftmann 2007-08-09 proper implementation of rational numbers