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A Joke or Pun or Such ( lemmy.blahaj.zone )

In some type theories, (\mathsf{Maybe} : \prod_{\left(a : \mathsf{Level}\right)} \left(\mathsf{Set}\ a \rightarrow \mathsf{Set}\ a\right)) is a type function for creating optional values, i.e., "objects which may or may not contain a value". More formally, a term of type (\mathsf{Maybe}\ A) is either (\mathsf{nothing}) or ...