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src/HOL/Library/Product_Vector.thy
changeset 51002 496013a6eb38
parent 49962 a8cc904a6820
child 51478 270b21f3ae0a 
--- a/src/HOL/Library/Product_Vector.thy	Thu Jan 31 12:09:07 2013 +0100
+++ b/src/HOL/Library/Product_Vector.thy	Thu Jan 31 17:42:12 2013 +0100
@@ -408,8 +408,6 @@
 
 instance proof
   fix r :: real and x y :: "'a \<times> 'b"
-  show "0 \<le> norm x"
-    unfolding norm_prod_def by simp
   show "norm x = 0 \<longleftrightarrow> x = 0"
     unfolding norm_prod_def
     by (simp add: prod_eq_iff)
isabelle