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src/HOL/Library/Permutation.thy
changeset 21404 eb85850d3eb7
parent 19380 b808efaa5828
child 23755 1c4672d130b1 
--- a/src/HOL/Library/Permutation.thy	Fri Nov 17 02:19:55 2006 +0100
+++ b/src/HOL/Library/Permutation.thy	Fri Nov 17 02:20:03 2006 +0100
@@ -12,7 +12,7 @@
   perm :: "('a list * 'a list) set"
 
 abbreviation
-  perm_rel :: "'a list => 'a list => bool"    ("_ <~~> _"  [50, 50] 50)
+  perm_rel :: "'a list => 'a list => bool"  ("_ <~~> _"  [50, 50] 50) where
   "x <~~> y == (x, y) \<in> perm"
 
 inductive perm
isabelle