Mercurial > hg > Papers > 2021 > soto-thesis
view prepaper/src/NatAddSym.agda.replaced @ 0:3dba680da508
init-test
author | soto |
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date | Tue, 08 Dec 2020 19:06:49 +0900 |
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open import Relation.Binary.PropositionalEquality open import nat open import nat_add open @$\equiv$@-Reasoning module nat_add_sym where addSym : (n m : Nat) @$\rightarrow$@ n + m @$\equiv$@ 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