1.1 --- a/src/HOL/Multivariate_Analysis/Finite_Cartesian_Product.thy	Thu Jan 31 12:09:07 2013 +0100
     1.2 +++ b/src/HOL/Multivariate_Analysis/Finite_Cartesian_Product.thy	Thu Jan 31 17:42:12 2013 +0100
     1.3 @@ -387,9 +387,6 @@
     1.4  
     1.5  instance proof
     1.6    fix a :: real and x y :: "'a ^ 'b"
     1.7 -  show "0 \<le> norm x"
     1.8 -    unfolding norm_vec_def
     1.9 -    by (rule setL2_nonneg)
    1.10    show "norm x = 0 \<longleftrightarrow> x = 0"
    1.11      unfolding norm_vec_def
    1.12      by (simp add: setL2_eq_0_iff vec_eq_iff)