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fix
author soto@cr.ie.u-ryukyu.ac.jp
date Tue, 15 Sep 2020 07:06:29 +0900
parents 73127e0ab57c
children
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open import nat
module nat_add where
 
_+_ : Nat -> Nat -> Nat
O + m     = m
(S n) + m = S (n + m)