Arrow to add one element at a ...

Logical OR in HXT without dupl...

Using monads, monoids, functor...

Could not deduce (Semigroup (T...

A monad is just a monoid in th...

Haskell, implementing Monoids....

Examples of monoids/semigroups...

What does Traversable is to Ap...

Don't understand notation ...

Is there a class that models &...

Haskell newtype that flips sem...

Is Last a free monoid?...

A monoid can see its elements ...

Why is my Semigroup/Monoid ins...

For what Alt in Monoid instanc...

Confused about why all morphis...

How to make my probability den...

Applicative instance trying to...

No Monoid instance for Integer...

Identity element for std::min/...

How are Haskell Monad laws der...

How can I define Pair as a Mon...

Writing a Haskell Options Data...

Why MonadPlus and not Monad + ...

What is the main difference be...

Distinction between typeclasse...

Why does the Alternative typec...

Why is there not 'Alternat...

Why is there no type class for...

Monoid vs MonadPlus...