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About: Type variable     Goto   Sponge   NotDistinct   Permalink

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In type theory and programming languages, a type variable is a mathematical variable ranging over types. Even in programming languages that allow mutable variables, a type variable remains an abstraction, in the sense that it does not correspond to some memory locations. # let id x = x;;val id : 'a -> 'a = In mathematical notation, the type of the function id is , where is a type variable.