haskell-semigroups: haskell-semigroups (Anything that associates) haskell-semigroups: haskell-semigroups: In mathematics, a semigroup is an algebraic structure consisting of haskell-semigroups: a set together with an associative binary operation. A semigroup haskell-semigroups: generalizes a monoid in that there might not exist an identity haskell-semigroups: element. It also (originally) generalized a group (a monoid with all haskell-semigroups: inverses) to a type where every element did not have to have an haskell-semigroups: inverse, thus the name semigroup. haskell-semigroups: haskell-semigroups: haskell-semigroups: