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DONE
author soto <soto@cr.ie.u-ryukyu.ac.jp>
date Sat, 08 Jan 2022 12:41:39 +0900
parents 339fb67b4375
children
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_-_ : Nat !$\rightarrow$! Nat !$\rightarrow$! Nat
n     - zero = n
zero  - suc m = zero
suc n - suc m = n - m