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New posts in category-theory

Why isn't there a simple syntax for coproduct types in Haskell?

What would be the methods of a bi-comonad?

Defining Categories and Category Laws in Haskell

Does each type have a unique catamorphism?

Why must fmap map every element of a List?

What's the relation of fold on Option, Either etc and fold on Traversable?

Functor instance for generic polymorphic ADTs in Haskell?

What is the relationship between bind and join?

What's the history behind the Functor type class?

Does * in (<*>) have a special meaning?

What is a purpose of Zap Functor and zap function in Haskell?

Is this an accurate example of a Haskell Pullback?

haskell category-theory

How is "a monoid on applicative functors" different than "a monoid in the category of endofunctors"?

What kind of morphism is `filter` in category theory?

Name for a type constructor that is both a category and a monad?

Can I implement this newtype as a composition of other types?

Every free monad over a ??? functor yields a comonad?

Use cases for adjunctions in Haskell