Abstract
Let ℕ be the set of nonnegative integers. A numerical semigroup is a nonempty subset S of ℕ that is closed under addition, contains the zero element, and whose complement in ℕ is finite.
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Rosales, J., García-Sánchez, P. (2009). Introduction. In: Numerical Semigroups. Developments in Mathematics, vol 20. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-0160-6_1
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DOI: https://doi.org/10.1007/978-1-4419-0160-6_1
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Online ISBN: 978-1-4419-0160-6
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