--- a/QuotMain.thy	Fri Dec 04 11:34:21 2009 +0100
+++ b/QuotMain.thy	Fri Dec 04 11:34:49 2009 +0100
@@ -136,16 +136,6 @@
 
 end
 
-(* EQUALS_RSP is stronger *)
-lemma equiv_trans2:
-  assumes e: "EQUIV R"
-  and     ac: "R a c"
-  and     bd: "R b d"
-  shows "R a b = R c d"
-using ac bd e
-unfolding EQUIV_REFL_SYM_TRANS TRANS_def SYM_def
-by (blast)
-
 section {* type definition for the quotient type *}
 
 (* the auxiliary data for the quotient types *)
@@ -1343,7 +1333,8 @@
       val rthm' = atomize_thm rthm
       val rule = procedure_inst context (prop_of rthm') (term_of concl)
       val rel_refl = map (fn x => @{thm EQUIV_REFL} OF [x]) rel_eqv
-      val trans2 = map (fn x => @{thm equiv_trans2} OF [x]) rel_eqv
+      val quotients = quotient_rules_get lthy
+      val trans2 = map (fn x => @{thm EQUALS_RSP} OF [x]) quotients
       val thm = Drule.instantiate' [] [SOME (snd (Thm.dest_comb concl))] @{thm QUOT_TRUE_i}
     in
       EVERY1