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Star operations on numerical semigroups: antichains and explicit results

We introduce an order on the set of non-divisorial ideals of a numerical semigroup $S$, and link antichains of this order with the star operations on $S$; subsequently, we use this order to find estimates on the number of star operations on $S$. We then use them to find an asymptotic estimate on the number of nonsymmetric numerical semigroups with $n$ or less star operations, and to determine these semigroups explicitly when $n=10$.

preprint2016arXivOpen access
Dario Spirito
math.COmath.AC
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Dario Spirito

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