X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fdama%2Ffields.ma;h=5ab17edae98c7e2eafd4a3a94e65125ab9e7c433;hb=810db29f760117d933ee1f74328043b8fce43847;hp=305c49764e9b651f368171ce00db323b29568956;hpb=dd3157d36216486d914a97cfff7a9cd34f009ffe;p=helm.git

diff --git a/matita/dama/fields.ma b/matita/dama/fields.ma
index 305c49764..5ab17edae 100644
--- a/matita/dama/fields.ma
+++ b/matita/dama/fields.ma
@@ -21,7 +21,7 @@ record is_field (R:ring) (inv:∀x:R.x ≠ 0 → R) : Prop
  {  (* multiplicative abelian properties *)
     mult_comm_: symmetric ? (mult R);
     (* multiplicative group properties *)
-    inv_inverse_: ∀x.∀p: x ≠ 0. mult ? (inv x p) x = 1
+    inv_inverse_: ∀x.∀p: x ≠ 0. inv x p * x = 1
  }.
 
 lemma opp_opp: ∀R:ring. ∀x:R. --x=x.