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diff --git a/theories/Num/DiscrProps.v b/theories/Num/DiscrProps.v
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+(*i $Id$ i*)
+
+Require Export DiscrAxioms.
+Require Export LtProps.
+
+(*s Properties of a discrete order *)
+
+Lemma lt_le_Sx_y : (x,y:N)(x<y) -> ((S x)<=y).
+EAuto with num.
+Save.
+Hints Resolve lt_le_Sx_y : num.
+\ No newline at end of file