Haskell zhōng de Functor lèixíng lèi duìyìng shùxué zhōng de hánzi.
Haskell's Functor typeclass corresponds to the mathematical functor.
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Mathematics / category theory only. The character 函 here echoes 函数 (hánshù, 'function'), reflecting that functors are a generalization of functions to map between entire structures rather than just elements.
