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arXiv 1807.07552math.CO
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一致相位拟阵的实现空间

Realization Spaces of Uniform Phased Matroids

Amanda Ruiz

摘要:

相位拟阵是具有附加结构的拟阵,其对于复向量排列起着与定向拟阵对于实向量排列相同的作用。一个定向的实现空间(分别为,相位的)拟阵是$\mathbb R^n$中的向量排列的空间(分别,$\mathbb C^n$),其对应于定向(分别,相位)拟阵,模坐标的变化。根据Mnëv的普适性定理,秩大于或等于$3$的一致定向拟阵的实现空间可以像任何开半代数簇一样复杂。相比之下,如果一致拟阵是一致的,则不具有本质定向的一致拟阵具有非常简单的实现空间。我们还提出了一个标准的可实现性的一致相拟阵,基本上没有定向。

英文摘要:

A phased matroid is a matroid with additional structure which plays the same role for complex vector arrangements that oriented matroids play for real vector arrangements. The realization space of an oriented (resp., phased) matroid is the space of vector arrangements in $\mathbb R^n$ (resp., $\mathbb C^n$) that correspond to oriented (resp., phased) matroid, modulo a change of coordinates. According to Mnëv's Universality Theorem, the realization spaces of uniform oriented matroids with rank greater than or equal to $3$ can be as complicated as any open semi-algebraic variety. In contrast, uniform phased matroids which are not essentially oriented have remarkably simple realization spaces if they are uniform. We also present a criterion for realizability of uniform phased matroids that are not essentially oriented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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