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arXiv 1502.03997math.CO
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基于根多面体三角剖分的子字复形

Subword complexes via triangulations of root polytopes

Laura Escobar, Karola Mészáros

摘要:

子字复形是由Knutson和Miller引入的单纯复形,用于说明舒伯特多项式和行列式理想的组合。他们证明了任何子字复形都同胚于一个球或一个球面,并询问了它们的几何实现。我们表明,一个家庭的子字复合体可以实现几何通过定期三角形的根多面体。这意味着一族$β$ -Grothendieck多项式是根多面体的细分代数中约化形式的特殊情况。我们也可以用$β$ -Grothendieck多项式来表示根多面体的体积和Ehrhart级数。

英文摘要:

Subword complexes are simplicial complexes introduced by Knutson and Miller to illustrate the combinatorics of Schubert polynomials and determinantal ideals. They proved that any subword complex is homeomorphic to a ball or a sphere and asked about their geometric realizations. We show that a family of subword complexes can be realized geometrically via regular triangulations of root polytopes. This implies that a family of $β$-Grothendieck polynomials are special cases of reduced forms in the subdivision algebra of root polytopes. We can also write the volume and Ehrhart series of root polytopes in terms of $β$-Grothendieck polynomials.

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