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We introduce a class of finite semigroups obtained by considering Rees quotients of numerical semigroups. Several natural questions concerning this class, as well as particular subclasses obtained by considering some special ideals, are answered while others remain open. We exhibit nice presentations for these semigroups and prove that the Rees quotients by ideals of , the positive integers under addition, constitute a set of generators for the pseudovariety of commutative and nilpotent semigroups.
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Manuel Delgado, Vítor H. Fernandes, Rees quotients of numerical semigroups. Port. Math. 70 (2013), no. 2, pp. 93–112DOI 10.4171/PM/1927