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