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add code, figure. and paper fix content
author ryokka
date Mon, 27 Jan 2020 20:41:36 +0900
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children e8655e0264b8
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+zero : { y : ℕ } → y + zero  ≡ y
+zero {zero} = refl
+zero {suc y} = cong ( λ x → suc x ) ( +zero {y} )