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arXiv 2008.08110math.COmath.AC
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小型和大型数值半群

Numerical Semigroups of small and large type

Deepesh Singhal

摘要:

数值半群是具有有限补数的自然数的子半群。数值半群的一些关键性质是它的Frobenius数F,亏格g和类型t。已知对任何数值半群$\frac{g}{F+1-g}\leq t\leq 2g-F$ .具有$t=2g-F$的数值半群称为几乎对称的,我们引入了一个新的性质来刻画它们。给出了具有$t=\frac{g}{F+1-g}$的数值半群的一个显式刻画.我们证明了对于固定的$α$,具有Frobenius数$F$和类型$F-α$的数值半群的个数对于大的$F$最终是常数.对于大的$g$,亏格为$g$且类型为$g-α$的数值半群的个数也最终是常数.

英文摘要:

A numerical semigroup is a sub-semigroup of the natural numbers that has a finite complement. Some of the key properties of a numerical semigroup are its Frobenius number F, genus g and type t. It is known that for any numerical semigroup $\frac{g}{F+1-g}\leq t\leq 2g-F$. Numerical semigroups with $t=2g-F$ are called almost symmetric, we introduce a new property that characterises them. We give an explicit characterisation of numerical semigroups with $t=\frac{g}{F+1-g}$. We show that for a fixed $α$ the number of numerical semigroups with Frobenius number $F$ and type $F-α$ is eventually constant for large $F$. Also the number of numerical semigroups with genus $g$ and type $g-α$ is also eventually constant for large $g$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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