Bartosz Milewski 6/8/2026

Kan Extensions in Haskell

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This article delves into Kan extensions in Haskell, treating functor composition as multiplication and exploring inverses through right and left extensions. It provides explicit Haskell implementations for right Kan extensions using the Ran type, demonstrates adjunctions via natural transformations, and introduces universal arrows as a generalization. The content is technical, focusing on category theory concepts applied to functional programming, making it highly relevant to IT/TECHNOLOGY.

Kan Extensions in Haskell

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