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DONE
author soto <soto@cr.ie.u-ryukyu.ac.jp>
date Sat, 08 Jan 2022 12:41:39 +0900
parents 339fb67b4375
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