src/HOL/Algebra/Ring.thy
2007-02-07 berghofe 2007-02-07 Adapted to changes in Finite_Set theory.
2006-12-22 ballarin 2006-12-22 Experimenting with interpretations of "definition".
2006-08-03 ballarin 2006-08-03 Restructured algebra library, added ideals and quotient rings.