arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.07140math.CO
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直积的Alon-Tarsi数

Alon -- Tarsi numbers of direct products

Alexey Gordeev, Fedor Petrov

摘要:

我们提供了一个一般框架的系数的图多项式是笛卡儿积。作为推论,我们证明了:如果$G=(V,E)$是一个顶点度为$2d(v), v\in V$的图,并且图多项式$\prod_{(i,j)\in E} (x_j-x_i)$包含一个“几乎中心”单项式(即一个单项式$\prod_v x_v^{c_v}$,其中对所有$v\in V$都有$|c_v-d(v)|\leqslant 1$),那么笛卡尔积$G\square C_{2n}$是$(d(\cdot)+2)$ -可选的.

英文摘要:

We provide a general framework on the coefficients of the graph polynomials of graphs which are Cartesian products. As a corollary, we prove that if $G=(V,E)$ is a graph with degrees of vertices $2d(v), v\in V$, and the graph polynomial $\prod_{(i,j)\in E} (x_j-x_i)$ contains an "almost central" monomial (that means a monomial $\prod_v x_v^{c_v}$, where $|c_v-d(v)|\leqslant 1$ for all $v\in V$), then the Cartesian product $G\square C_{2n}$ is $(d(\cdot)+2)$-choosable.

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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