view final_main/src/NatAdd.agda @ 0:83f997abf3b5

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author e155702
date Thu, 14 Feb 2019 16:51:50 +0900
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open import nat
module nat_add where
 
_+_ : Nat -> Nat -> Nat
O + m     = m
(S n) + m = S (n + m)