./math/hs-semigroups, Anything that associates

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Branch: pkgsrc-2021Q3, Version: 0.19.1nb2, Package name: hs-semigroups-0.19.1nb2, Maintainer: pho

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

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