Mercurial > hg > Papers > 2020 > soto-midterm
view src/NatAddSym.agda @ 1:73127e0ab57c
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author | soto@cr.ie.u-ryukyu.ac.jp |
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date | Tue, 08 Sep 2020 18:38:08 +0900 |
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open import Relation.Binary.PropositionalEquality open import nat open import nat_add open ≡-Reasoning module nat_add_sym where addSym : (n m : Nat) -> n + m ≡ m + n addSym O O = refl addSym O (S m) = cong S (addSym O m) addSym (S n) O = cong S (addSym n O) addSym (S n) (S m) = {!!} -- 後述