src/HOL/Cardinals/Order_Union.thy
changeset 67006 b1278ed3cd46
parent 66453 cc19f7ca2ed6
     1.1 --- a/src/HOL/Cardinals/Order_Union.thy	Sat Nov 04 18:57:49 2017 +0100
     1.2 +++ b/src/HOL/Cardinals/Order_Union.thy	Sat Nov 04 19:17:19 2017 +0100
     1.3 @@ -7,7 +7,7 @@
     1.4  section \<open>Order Union\<close>
     1.5  
     1.6  theory Order_Union
     1.7 -imports HOL.Order_Relation
     1.8 +imports Main
     1.9  begin
    1.10  
    1.11  definition Osum :: "'a rel \<Rightarrow> 'a rel \<Rightarrow> 'a rel"  (infix "Osum" 60) where