src/ZF/OrderType.ML

 goal OrderType.thy
     "!!i. [| j<i;  f: ord_iso(i,Memrel(i),j,Memrel(j))	\
 \         |] ==> R";
 by (forward_tac [lt_eq_pred] 1);
 be ltE 1;
-by (rtac (well_ord_Memrel RS not_well_ord_iso_pred RS notE) 1 THEN
-    assume_tac 1 THEN assume_tac 1);
+by (rtac (well_ord_Memrel RS well_ord_iso_predE) 1 THEN
+    assume_tac 3 THEN assume_tac 1);
 be subst 1;
 by (asm_full_simp_tac (ZF_ss addsimps [ord_iso_def]) 1);
 (*Combining the two simplifications causes looping*)
 by (asm_simp_tac (ZF_ss addsimps [Memrel_iff]) 1);
 by (fast_tac (ZF_cs addSEs [bij_is_fun RS apply_type]