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src/HOL/Library/Mapping.thy
changeset 67399 eab6ce8368fa
parent 66251 cd935b7cb3fb
child 68782 8ff34c1ad580 
--- a/src/HOL/Library/Mapping.thy	Wed Jan 10 15:21:49 2018 +0100
+++ b/src/HOL/Library/Mapping.thy	Wed Jan 10 15:25:09 2018 +0100
@@ -223,7 +223,7 @@
 lemma [transfer_rule]:
   assumes [transfer_rule]: "bi_total A"
     and [transfer_rule]: "bi_unique B"
-  shows "(pcr_mapping A B ===> pcr_mapping A B ===> op=) HOL.eq HOL.equal"
+  shows "(pcr_mapping A B ===> pcr_mapping A B ===> (=)) HOL.eq HOL.equal"
   unfolding equal by transfer_prover
 
 lemma of_alist_transfer [transfer_rule]:
isabelle