Rosales, J. C.:
Adding or removing an element from a pseudo-symmetric numerical semigroup
Bollettino dell'Unione Matematica Italiana Serie 8 9-B (2006), fasc. n.3, p. 681-696, (English)
pdf (397 Kb), djvu (166 Kb). | MR2274120 | Zbl 1147.20052
Sunto
Se $S$ è un semigruppo numerico pseudo-simmetrico, se $g$ è il suo numero di Frobenius e se $x$ è un generatore minimo di $S$ allora anche $S \cup \{g\}$, $S \setminus \{g\}$ e $S \cup \{\frac{1}{2}g, g\}$ sono semigruppi numerici. In questo lavoro ci proponiamo di studiare tali costruzioni.
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