changeset 33676 | 802f5e233e48 |
parent 33364 | 2bd12592c5e8 |
child 34146 | 14595e0c27e8 |
--- a/src/HOL/Ring_and_Field.thy Fri Nov 13 19:49:13 2009 +0100 +++ b/src/HOL/Ring_and_Field.thy Fri Nov 13 22:01:01 2009 +0100 @@ -1301,6 +1301,10 @@ lemma dvd_abs_iff [simp]: "m dvd (abs k) \<longleftrightarrow> m dvd k" by (simp add: abs_if) +lemma dvd_if_abs_eq: + "abs l = abs (k) \<Longrightarrow> l dvd k" +by(subst abs_dvd_iff[symmetric]) simp + end class ordered_field = field + ordered_idom