src/HOL/Computational_Algebra/Field_as_Ring.thy
21 months ago haftmann 2017-10-09 clarified uniqueness criterion for euclidean rings
21 months ago haftmann 2017-10-08 euclidean rings need no normalization
2017-04-07 wenzelm 2017-04-07 tuned headers;
2017-04-06 haftmann 2017-04-06 session containing computational algebra