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Equivalence of Applicative Functors and Multifunctors

This note spells out the equivalence of Haskell's Applicative functors (lax monoidal functors) with multi-functors (Haskell's liftA function family, functors in multi-categories).

That is, the somewhat Baroque equations for pure and <*> can be replaced by a uniform equation scheme for the liftA family.

See the PDF.