src/HOL/Library/Permutation.thy
changeset 21404 eb85850d3eb7
parent 19380 b808efaa5828
child 23755 1c4672d130b1
     1.1 --- a/src/HOL/Library/Permutation.thy	Fri Nov 17 02:19:55 2006 +0100
     1.2 +++ b/src/HOL/Library/Permutation.thy	Fri Nov 17 02:20:03 2006 +0100
     1.3 @@ -12,7 +12,7 @@
     1.4    perm :: "('a list * 'a list) set"
     1.5  
     1.6  abbreviation
     1.7 -  perm_rel :: "'a list => 'a list => bool"    ("_ <~~> _"  [50, 50] 50)
     1.8 +  perm_rel :: "'a list => 'a list => bool"  ("_ <~~> _"  [50, 50] 50) where
     1.9    "x <~~> y == (x, y) \<in> perm"
    1.10  
    1.11  inductive perm