1.1 --- a/src/HOL/Library/Quotient_Set.thy	Wed May 16 18:16:51 2012 +0200
     1.2 +++ b/src/HOL/Library/Quotient_Set.thy	Wed May 16 19:15:45 2012 +0200
     1.3 @@ -34,7 +34,7 @@
     1.4  lemma set_rel_eq [relator_eq]: "set_rel (op =) = (op =)"
     1.5    unfolding set_rel_def fun_eq_iff by auto
     1.6  
     1.7 -lemma reflp_set_rel: "reflp R \<Longrightarrow> reflp (set_rel R)"
     1.8 +lemma reflp_set_rel[reflp_preserve]: "reflp R \<Longrightarrow> reflp (set_rel R)"
     1.9    unfolding reflp_def set_rel_def by fast
    1.10  
    1.11  lemma symp_set_rel: "symp R \<Longrightarrow> symp (set_rel R)"