Functor is for (a -> b) -> (f a -> f b), what is for (Category c) => c a b -> c (f a)...

"Generalized arrows" and proc notation?...

Bidirectional Arrow...

Is (\f -> fmap f id) always equivalent to arr?...

Control.Category, what does >>> and <<< mean?...

Would a type class "between" Category and Arrow make sense?...

How to define an instance of Data.Foldable.Constrained?...

Difference of constraints in Semigroup and Monoid instances...

How to define an instance of Control.Functor.Constrained?...

Examples of Cartesian (Profunctor)?...

Why this structure-preserving "fmap" cannot be acepted in this Functor's class instanc...

Common functionality for different types...

Relation between the Semigroupoid and Semigroup classes...

What's wrong with defining composition this way?...

Difficulty in defining the Relation type as an instance of the Category class...

Is there a reason that `Functor` is not a superclass of `Category`?...

What good is Control.Category?...

Generalising ($) like Control.Category generalises (.)...

Generalization of Exponential Type...

Defining Categories and Category Laws in Haskell...

What is the significance of the id member's type in the Category class?...

Error trying to define type Relation [(a,b)] as an instance of Category class...