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author | e155702 |
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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