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
中科院分区:
文献类型:
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作者:
Li Li;A. Yong
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
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