Some degenerations of Kazhdan–Lusztig ideals and multiplicities of Schubert varieties

Some degenerations of Kazhdan–Lusztig ideals and multiplicities of Schubert varieties
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Kazhdan-Lusztig 理想的一些退化和舒伯特变体的多样性

DOI:
10.1016/j.aim.2011.09.010
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发表时间:
2010
影响因子:
1.7
通讯作者:
A. Yong
A. Yong
中科院分区:
数学1区
文献类型:
--
作者:
Li Li;A. Yong

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通过Kazhdan-Lusztig理想的Gröbner退化,研究了Schubert簇在完备旗簇中的点的Hilbert-Samuel重数.在covexillary的情况下,我们给出了一个明显的积极的组合规则的多重性,通过建立(与Gröbner基础)的减少限制,其斯坦利-Reisner单纯复形同胚到一个壳球或球。我们表明,多重计数的方面,这个复杂的数量。我们还得到了局部环的Hilbert级数的一个公式。特别地,我们的工作给出了Grassmannian Schubert簇的重数规则,为Lakshmibai和Weyman(1990)[26],Rosenthal和Zelevinsky(2001)[37],Krattenthaler(2001)[22],Kodiyalam和Raghavan(2003)[21],Kreiman和Lakshmibai(2004)[24]的公式提供了替代陈述和证明。Ikeda and Naruse(2009)[13]以及Woo and Yong(2009)[40]。我们建议我们的方法扩展到一般情况下。
We study Hilbert–Samuel multiplicity for points of Schubert varieties in the complete flag variety, by Gröbner degenerations of the Kazhdan–Lusztig ideal. In the covexillary case, we give a manifestly positive combinatorial rule for multiplicity by establishing (with a Gröbner basis) a reduced limit whose Stanley–Reisner simplicial complex is homeomorphic to a shellable ball or sphere. We show that multiplicity counts the number of facets of this complex. We also obtain a formula for the Hilbert series of the local ring. In particular, our work gives a multiplicity rule for Grassmannian Schubert varieties, providing alternative statements and proofs to formulae of Lakshmibai and Weyman (1990) [26], Rosenthal and Zelevinsky (2001) [37], Krattenthaler (2001) [22], Kodiyalam and Raghavan (2003) [21], Kreiman and Lakshmibai (2004) [24], Ikeda and Naruse (2009) [13] and Woo and Yong (2009) [40]. We suggest extensions of our methodology to the general case.
DOI: --
发表时间: 2019
期刊:
影响因子: --
作者:
Hoshi Yuichiro;T. Ikeda
通讯作者: T. Ikeda
等变舒伯特微积分的组合方法
DOI: --
发表时间: 2008
期刊:
影响因子: --
作者:
T.;Ohtsuka;Takeshi Ikeda;池田 岳;池田 岳
通讯作者: 池田 岳