src/HOL/Library/Boolean_Algebra.thy
changeset 25594 43c718438f9f
parent 25283 c532fd8445a2
child 25691 8f8d83af100a
     1.1 --- a/src/HOL/Library/Boolean_Algebra.thy	Mon Dec 10 11:24:08 2007 +0100
     1.2 +++ b/src/HOL/Library/Boolean_Algebra.thy	Mon Dec 10 11:24:09 2007 +0100
     1.3 @@ -8,7 +8,7 @@
     1.4  header {* Boolean Algebras *}
     1.5  
     1.6  theory Boolean_Algebra
     1.7 -imports Main
     1.8 +imports PreList
     1.9  begin
    1.10  
    1.11  locale boolean =