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arXiv 1004.4950math.COmath.AG
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迷向线性空间与赋值δ-拟阵

Isotropical Linear Spaces and Valuated Delta-Matroids

Felipe Rincón

摘要:

旋量簇由n × n斜对称矩阵的主Pfrons之间的二次Wick关系切割。它的点对应于2n维向量空间的n维迷向子空间。在本文中,我们tropicalize这张照片,我们开发了一个组合理论的热带威克向量和热带线性空间是热带各向同性。我们的特点热带威克矢量的细分三角洲拟阵多面体,我们研究在何种程度上的威克关系形成一个热带的基础。我们的理论将热带线性空间和赋值拟阵的几个结果推广到D型Coxeter拟阵类。

英文摘要:

The spinor variety is cut out by the quadratic Wick relations among the principal Pfaffians of an n x n skew-symmetric matrix. Its points correspond to n-dimensional isotropic subspaces of a 2n-dimensional vector space. In this paper we tropicalize this picture, and we develop a combinatorial theory of tropical Wick vectors and tropical linear spaces that are tropically isotropic. We characterize tropical Wick vectors in terms of subdivisions of Delta-matroid polytopes, and we examine to what extent the Wick relations form a tropical basis. Our theory generalizes several results for tropical linear spaces and valuated matroids to the class of Coxeter matroids of type D.

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