src/HOL/Library/Permutation.thy
changeset 55584 a879f14b6f95
parent 53238 01ef0a103fc9
child 56154 f0a927235162
     1.1 --- a/src/HOL/Library/Permutation.thy	Wed Feb 19 22:02:23 2014 +1100
     1.2 +++ b/src/HOL/Library/Permutation.thy	Wed Feb 19 16:32:37 2014 +0100
     1.3 @@ -157,7 +157,7 @@
     1.4    apply (case_tac "remdups xs")
     1.5     apply simp_all
     1.6    apply (subgoal_tac "a \<in> set (remdups ys)")
     1.7 -   prefer 2 apply (metis set.simps(2) insert_iff set_remdups)
     1.8 +   prefer 2 apply (metis set_simps(2) insert_iff set_remdups)
     1.9    apply (drule split_list) apply(elim exE conjE)
    1.10    apply (drule_tac x=list in spec) apply(erule impE) prefer 2
    1.11     apply (drule_tac x="ysa@zs" in spec) apply(erule impE) prefer 2