kili 60060e9cb0 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. ok ajacoutot@		2012-01-23 21:02:17 +00:00
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