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9 lines
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9 lines
428 B
Plaintext
Haskell 98 semigroups In mathematics, a semigroup is an algebraic structure
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consisting of a set together with an associative binary operation. A
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semigroup generalizes a monoid in that there might not exist an identity
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element. It also (originally) generalized a group (a monoid with all
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inverses) to a type where every element did not have to have an inverse,
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thus the name semigroup.
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WWW: http://github.com/ekmett/semigroups/
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