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init-test
author soto
date Tue, 08 Dec 2020 19:06:49 +0900
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+zero : { y : ℕ } → y + zero  ≡ y
+zero {zero} = refl
+zero {suc y} = cong suc ( +zero {y} )

-- cong : ∀ (f : A → B) {x y} → x ≡ y → f x ≡ f y
-- cong f refl = refl