src/HOL/Datatype_Examples/TreeFsetI.thy
changeset 63167 0909deb8059b
parent 58889 5b7a9633cfa8
child 66453 cc19f7ca2ed6
--- a/src/HOL/Datatype_Examples/TreeFsetI.thy	Thu May 26 16:57:14 2016 +0200
+++ b/src/HOL/Datatype_Examples/TreeFsetI.thy	Thu May 26 17:51:22 2016 +0200
@@ -6,7 +6,7 @@
 Finitely branching possibly infinite trees, with sets of children.
 *)
 
-section {* Finitely Branching Possibly Infinite Trees, with Sets of Children *}
+section \<open>Finitely Branching Possibly Infinite Trees, with Sets of Children\<close>
 
 theory TreeFsetI
 imports "~~/src/HOL/Library/FSet"