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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2106.15464math.CO
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正则图的连接图的度

Degrees in link graphs of regular graphs

Itai Benjamini, John Haslegrave

摘要:

本文分析了有限正则图,即由非平凡球面导出的子图的连接图的度的一个极值问题。我们表明,如果$G$是$d$ -正则和连接,但不完全,然后一些链接图的$G$有最小程度最多$\lfloor 2d/3\rfloor-1$,如果$G$是足够大的$d$,然后一些链接图有最小程度最多$\lfloor d/2\rfloor-1$,这两个界限是最好的可能。我们也给出了相应的最佳可能的结果,相应的问题,球诱导的子图,而不是领域,被认为是。我们激发这些问题提出了一个猜想,在大有界度图的链接图的扩展,连同启发式的理由。

英文摘要:

We analyse an extremal question on the degrees of the link graphs of a finite regular graph, that is, the subgraphs induced by non-trivial spheres. We show that if $G$ is $d$-regular and connected but not complete then some link graph of $G$ has minimum degree at most $\lfloor 2d/3\rfloor-1$, and if $G$ is sufficiently large in terms of $d$ then some link graph has minimum degree at most $\lfloor d/2\rfloor-1$; both bounds are best possible. We also give the corresponding best-possible result for the corresponding problem where subgraphs induced by balls, rather than spheres, are considered. We motivate these questions by posing a conjecture concerning expansion of link graphs in large bounded-degree graphs, together with a heuristic justification thereof.

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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