minimization.ma

[helm.git] / helm / software / matita / nlibrary / nat / minus.ma

diff --git a/helm/software/matita/nlibrary/nat/minus.ma b/helm/software/matita/nlibrary/nat/minus.ma
index f800cc0587c06799bb05848c216b56d6ae003b76..86a4b1df22866d3bfbd169de719e8889d4a79b13 100644 (file)
--- a/helm/software/matita/nlibrary/nat/minus.ma
+++ b/helm/software/matita/nlibrary/nat/minus.ma
@@ -22,5 +22,7 @@ nlet rec minus (n:nat) (m:nat) on m : nat ≝
       [ O ⇒ O
       | S n' ⇒ minus n' m']].
 
+interpretation "natural minus" 'minus x y = (minus x y).
+
 naxiom le_minus: ∀n,m,p. le n m → le (minus n p) m.
-naxiom lt_minus: ∀n,m,p. lt n m → lt (minus n p) m.
\ No newline at end of file
+naxiom lt_minus: ∀n,m,p. lt n m → lt (minus n p) m.