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view paper/src/function.agda @ 2:c7acb9211784

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add code, figure. and paper fix content
author ryokka
date Mon, 27 Jan 2020 20:41:36 +0900
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_-_ :ℕ →ℕ →ℕ
x - zero  = x
zero - _  = zero
(suc x) - (suc y)  = x - y