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src/HOL/Zorn.thy
changeset 67399 eab6ce8368fa
parent 63572 c0cbfd2b5a45
child 67443 3abf6a722518 
--- a/src/HOL/Zorn.thy	Wed Jan 10 15:21:49 2018 +0100
+++ b/src/HOL/Zorn.thy	Wed Jan 10 15:25:09 2018 +0100
@@ -356,7 +356,7 @@
 
 subsubsection \<open>Results for the proper subset relation\<close>
 
-interpretation subset: pred_on "A" "op \<subset>" for A .
+interpretation subset: pred_on "A" "(\<subset>)" for A .
 
 lemma subset_maxchain_max:
   assumes "subset.maxchain A C"
isabelle