1.1 --- a/src/HOL/Relation_Power.thy	Mon Aug 16 14:21:54 2004 +0200
     1.2 +++ b/src/HOL/Relation_Power.thy	Mon Aug 16 14:22:27 2004 +0200
     1.3 @@ -12,7 +12,9 @@
     1.4  Examples: range(f^n) = A and Range(R^n) = B need constraints.
     1.5  *)
     1.6  
     1.7 -theory Relation_Power = Nat:
     1.8 +theory Relation_Power
     1.9 +import Nat
    1.10 +begin
    1.11  
    1.12  instance
    1.13    set :: (type) power ..  (* only ('a * 'a) set should be in power! *)