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arXiv 2108.06599math.CO
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Sidorenko猜想的双正则性

Biregularity in Sidorenko's Conjecture

Leonardo N. Coregliano, Alexander A. Razborov

摘要:

Sidorenko猜想指出,当$W$是常数函数时,在给定边密度的双图子$W$中,双图$G$的密度最小。B的一个结果的一个推论。Szegedy的一个重要结论是,在进一步假设$W$是双正则的情况下,证明Sidorenko猜想就足够了。本文用一个更初等的证明恢复了这一结果。利用这个双正则性结果及其证明的一些思想,我们还得到了与Sidorenko猜想有关的其他几个结果的简单证明。此外,我们还表明,有一个特殊类型的树分解,称为反射树分解,满足Sidorenko猜想的双图。这统一和推广了文献中的强树分解和$N$ -分解的概念。

英文摘要:

Sidorenko's Conjecture says that the minimum density of a bigraph $G$ in a bigraphon $W$ of a given edge density is attained when $W$ is a constant function. A consequence of a result by B. Szegedy is that it is enough to show Sidorenko's Conjecture under the further assumption that $W$ is biregular. In this paper, we retrieve this result with a more elementary proof. With this biregularity result and some ideas of its proof, we also obtain simple proofs of several other results related to Sidorenko's Conjecture. Furthermore, we also show that bigraphs that have a special type of tree decomposition, called reflective tree decomposition, satisfy Sidorenko's conjecture. This both unifies and generalizes the notions of strong tree decompositions and $N$-decompositions from the literature.

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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