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fix paper, slide
author ryokka
date Tue, 11 Feb 2020 02:31:26 +0900
parents c7acb9211784
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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