src/HOL/Fields.thy
2010-02-10 haftmann 2010-02-10 moved lemma field_le_epsilon from Real.thy to Fields.thy
2010-02-10 haftmann 2010-02-10 moved constants inverse and divide to Ring.thy
2010-02-08 haftmann 2010-02-08 renamed OrderedGroup to Groups; split theory Ring_and_Field into Rings Fields