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src/HOL/Hahn_Banach/Vector_Space.thy
changeset 54230 b1d955791529
parent 46867 0883804b67bb
child 55018 2a526bd279ed 
--- a/src/HOL/Hahn_Banach/Vector_Space.thy	Thu Oct 31 16:54:22 2013 +0100
+++ b/src/HOL/Hahn_Banach/Vector_Space.thy	Fri Nov 01 18:51:14 2013 +0100
@@ -112,7 +112,7 @@
 proof -
   assume x: "x \<in> V"
   have " (a - b) \<cdot> x = (a + - b) \<cdot> x"
-    by (simp add: diff_minus)
+    by simp
   also from x have "\<dots> = a \<cdot> x + (- b) \<cdot> x"
     by (rule add_mult_distrib2)
   also from x have "\<dots> = a \<cdot> x + - (b \<cdot> x)"
isabelle