Let A pabe a nonempty subset of positive integers. In this paper we study the set of numerical semigroups that fulfill: if x, y ⊆ ℕS and x > y > min (S0), then x-y ∉ A.
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J. C. Rosales
M. B. Branco
University of Évora
Márcio A. Traesel
Federal Institute of São Paulo
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Rosales et al. (Wed,) studied this question.