src/HOL/Lattices_Big.thy
changeset 55089 181751ad852f
parent 54868 bab6cade3cc5
child 55803 74d3fe9031d8
     1.1 --- a/src/HOL/Lattices_Big.thy	Mon Jan 20 23:07:23 2014 +0100
     1.2 +++ b/src/HOL/Lattices_Big.thy	Mon Jan 20 23:34:26 2014 +0100
     1.3 @@ -6,7 +6,7 @@
     1.4  header {* Big infimum (minimum) and supremum (maximum) over finite (non-empty) sets *}
     1.5  
     1.6  theory Lattices_Big
     1.7 -imports Finite_Set
     1.8 +imports Finite_Set Option
     1.9  begin
    1.10  
    1.11  subsection {* Generic lattice operations over a set *}