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author ryokka
date Wed, 12 Feb 2020 17:55:00 +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) @$\equiv$@ (S (S (S (S O))))
3+1 = refl