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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_ : Nat !$\rightarrow$! Nat !$\rightarrow$! Bool
zero    ==Nat zero    = true
(suc n) ==Nat zero    = false
zero    ==Nat (suc m) = false
(suc n) ==Nat (suc m) = n ==Nat m

instance
  natHas== : Eq Nat
  natHas== = record { _==_ = _==Nat_}