8 lines
407 B
Text
8 lines
407 B
Text
In mathematics, a semigroup is an algebraic structure consisting of a
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set together with an associative binary operation. A semigroup
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generalizes a monoid in that there might not exist an identity element.
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It also (originally) generalized a group (a monoid with all inverses) to
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a type where every element did not have to have an inverse, thus the
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name semigroup.
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WWW: https://github.com/ekmett/semigroups
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