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Bookbinding
author atton <atton@cr.ie.u-ryukyu.ac.jp>
date Mon, 27 Feb 2017 20:29:43 +0900
parents fb42478e4c96
children
line wrap: on
line source

_==Nat_ : Nat -> Nat -> 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_}