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src/HOL/Multivariate_Analysis/Finite_Cartesian_Product.thy
changeset 51002 496013a6eb38
parent 50880 b22ecedde1c7
child 52143 36ffe23b25f8 
--- a/src/HOL/Multivariate_Analysis/Finite_Cartesian_Product.thy	Thu Jan 31 12:09:07 2013 +0100
+++ b/src/HOL/Multivariate_Analysis/Finite_Cartesian_Product.thy	Thu Jan 31 17:42:12 2013 +0100
@@ -387,9 +387,6 @@
 
 instance proof
   fix a :: real and x y :: "'a ^ 'b"
-  show "0 \<le> norm x"
-    unfolding norm_vec_def
-    by (rule setL2_nonneg)
   show "norm x = 0 \<longleftrightarrow> x = 0"
     unfolding norm_vec_def
     by (simp add: setL2_eq_0_iff vec_eq_iff)
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