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add code, figure. and paper fix content
author ryokka
date Mon, 27 Jan 2020 20:41:36 +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