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src/HOL/Datatype_Examples/TreeFI.thy
changeset 63167 0909deb8059b
parent 58889 5b7a9633cfa8 
--- a/src/HOL/Datatype_Examples/TreeFI.thy	Thu May 26 16:57:14 2016 +0200
+++ b/src/HOL/Datatype_Examples/TreeFI.thy	Thu May 26 17:51:22 2016 +0200
@@ -6,7 +6,7 @@
 Finitely branching possibly infinite trees.
 *)
 
-section {* Finitely Branching Possibly Infinite Trees *}
+section \<open>Finitely Branching Possibly Infinite Trees\<close>
 
 theory TreeFI
 imports Main
isabelle