1 Ebooks bởi P. A. García-Sánchez
J.C. Rosales & P. A. García-Sánchez: Numerical Semigroups
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 ?nite. If n , …, n …
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