arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.01428math.AC
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数值半群环的标准迹理想与剩余

Canonical trace ideal and residue for numerical semigroup rings

Jürgen Herzog, Takayuki Hibi, Dumitru I. Stamate

摘要:

对于数值半群环$K[H]$,研究了其典型理想的迹.这个理想的余长称为$H$的剩余。这个不变测度$H$离对称有多远,即$K[H]$离Gorenstein环有多远。我们注意到,典型的迹理想包含导体理想,我们研究的剩余的界限。对于$3$生成的数值半群,我们给出了$H$的标准迹理想和剩余的显式公式.因此,在这种情况下,我们可以分类那些其残留物是最多一个(近Gorenstein的),我们最终的周期性行为的残留物在一个移动的家庭。

英文摘要:

For a numerical semigroup ring $K[H]$ we study the trace of its canonical ideal. The colength of this ideal is called the residue of $H$. This invariant measures how far is $H$ from being symmetric, i.e. $K[H]$ from being a Gorenstein ring. We remark that the canonical trace ideal contains the conductor ideal, and we study bounds for the residue. For $3$-generated numerical semigroups we give explicit formulas for the canonical trace ideal and the residue of $H$. Thus, in this setting we can classify those whose residue is at most one (the nearly-Gorenstein ones), and we show the eventual periodic behaviour of the residue in a shifted family.

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