--- a/src/HOL/Library/Quotient_Set.thy Wed May 16 18:16:51 2012 +0200
+++ b/src/HOL/Library/Quotient_Set.thy Wed May 16 19:15:45 2012 +0200
@@ -34,7 +34,7 @@
lemma set_rel_eq [relator_eq]: "set_rel (op =) = (op =)"
unfolding set_rel_def fun_eq_iff by auto
-lemma reflp_set_rel: "reflp R \<Longrightarrow> reflp (set_rel R)"
+lemma reflp_set_rel[reflp_preserve]: "reflp R \<Longrightarrow> reflp (set_rel R)"
unfolding reflp_def set_rel_def by fast
lemma symp_set_rel: "symp R \<Longrightarrow> symp (set_rel R)"