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DONE
author soto <soto@cr.ie.u-ryukyu.ac.jp>
date Sat, 08 Jan 2022 12:41:39 +0900
parents c59202657321
children
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+zero : { y : ℕ } → y + zero  ≡ y
+zero {zero} = refl
+zero {suc y} = cong suc ( +zero {y} )