view final_pre/src/NatAdd.agda @ 7:0e8b9646d43f

add final_pre
author e155702
date Sun, 17 Feb 2019 05:39:59 +0900
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open import nat
module nat_add where
 
_+_ : Nat -> Nat -> Nat
O + m     = m
(S n) + m = S (n + m)