changeset 67964 | 08cc5ab18c84 |
parent 67929 | 30486b96274d |
child 67965 | aaa31cd0caef |
--- a/src/HOL/Data_Structures/Tree234_Set.thy Sat Apr 07 22:09:57 2018 +0200 +++ b/src/HOL/Data_Structures/Tree234_Set.thy Sun Apr 08 09:46:33 2018 +0200 @@ -6,7 +6,7 @@ imports Tree234 Cmp - "../Data_Structures/Set_by_Ordered" + "Set_Interfaces" begin subsection \<open>Set operations on 2-3-4 trees\<close>