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

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author e155702
date Sun, 17 Feb 2019 05:39:59 +0900
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open import Relation.Binary.PropositionalEquality
open import nat
open import nat_add

module three_plus_one where

3+1 : (S (S (S O)))  +  (S O) ≡ (S (S (S (S O))))
3+1 = refl