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fix
author soto@cr.ie.u-ryukyu.ac.jp
date Tue, 15 Sep 2020 07:06:29 +0900
parents 73127e0ab57c
children
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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