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A biordered set is a mathematical object that occurs in the description of the structure of the set of idempotents in a semigroup.
The set of idempotents in a semigroup is a biordered set and every biordered set is the set of idempotents of some semigroup.A regular biordered set is a biordered set with an additional property. The set of idempotents in a regular semigroup is a regular biordered set, and every regular biordered set is the set of idempotents of some regular semigroup.
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