src/HOL/Real/PNat.ML
changeset 10231 178a272bceeb
parent 10202 9e8b4bebc940
child 10292 19753287b9df
--- a/src/HOL/Real/PNat.ML	Tue Oct 17 10:20:43 2000 +0200
+++ b/src/HOL/Real/PNat.ML	Tue Oct 17 10:21:12 2000 +0200
@@ -244,7 +244,7 @@
 qed "pnat_less_not_sym";
 
 (* [| x < y;  ~P ==> y < x |] ==> P *)
-bind_thm ("pnat_less_asym", pnat_less_not_sym RS swap);
+bind_thm ("pnat_less_asym", pnat_less_not_sym RS contrapos_np);
 
 Goalw [pnat_less_def] "~ y < (y::pnat)";
 by Auto_tac;