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New posts in category-theory

Is Last a free monoid?

Why prefer monoids over semigroups in Haskell? Why do we need mempty?

If Either can be either Left or Right but not both, then why does it correspond to OR instead of XOR in Curry-Howard correspondence?

Do all Type Classes in Haskell Have a Category Theoretic Analogue?

haskell category-theory

How to prove basic sequence properties

haskell category-theory

Higher order Functors in scala

Defining Free Bind in a way that is compatible with the Free Monad

What is the general case of QuickCheck's promote function?

What means precisely "function inside a functor"

haskell category-theory

Are haskell data types co-algebras by default?

haskell category-theory

Why can't I find any law violations for the NotQuiteCofree not-quite-comonad?

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

Applying Semantics to Free Monads

Categorical structure in Haskell

haskell category-theory

Do the functor laws prove complete preservation of structure?

Are all fixed size containers strong monoidal functors, and/or vice versa?

What exactly is a category?

Initial algebra for rose trees