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src/HOL/ex/Ballot.thy
changeset 68188 2af1f142f855
parent 68072 493b818e8e10
child 69597 ff784d5a5bfb 
--- a/src/HOL/ex/Ballot.thy	Tue May 15 06:23:12 2018 +0200
+++ b/src/HOL/ex/Ballot.thy	Tue May 15 11:33:43 2018 +0200
@@ -8,6 +8,7 @@
 theory Ballot
 imports
   Complex_Main
+  "HOL-Library.FuncSet"
 begin
 
 subsection \<open>Preliminaries\<close>
isabelle