1.1 --- a/src/HOL/Multivariate_Analysis/Determinants.thy Wed Aug 17 14:42:59 2011 -0700
1.2 +++ b/src/HOL/Multivariate_Analysis/Determinants.thy Wed Aug 17 15:02:17 2011 -0700
1.3 @@ -131,7 +131,7 @@
1.4 {fix p assume p: "p \<in> {p. p permutes ?U}"
1.5 from p have pU: "p permutes ?U" by blast
1.6 have sth: "sign (inv p) = sign p"
1.7 - by (metis sign_inverse fU p mem_def Collect_def permutation_permutes)
1.8 + by (metis sign_inverse fU p mem_Collect_eq permutation_permutes)
1.9 from permutes_inj[OF pU]
1.10 have pi: "inj_on p ?U" by (blast intro: subset_inj_on)
1.11 from permutes_image[OF pU]