Monoid

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A monoid is an algebraic structure with a single, associative binary operation and an identity element.

See also

• An introduction: Haskell Monoids and their Uses
• The Data.Monoid module
• The blog article Monoids and Finger Trees
• Monad.Reader issue 11, "How to Refold a Map." (PDF), and a follow up
• Category theory
• Arrows, like Monads, are Monoids (PDF)