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FIX
author soto <soto@cr.ie.u-ryukyu.ac.jp>
date Fri, 27 May 2022 12:31:39 +0900
parents 14a0e409d574
children
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_-_ : Nat → Nat → Nat
n     - zero = n
zero  - suc m = zero
suc n - suc m = n - m