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view paper/src/Maybe.agda.replaced @ 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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data Maybe {a} (A : Set a) : Set a where
  just    : (x : A) @$\rightarrow$@ Maybe A
  nothing : Maybe A