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arXiv 2203.12503math.CO
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图的笛卡儿积的Turán数

The Turán number of the Cartesian product of graphs

Dingyuan Liu

摘要:

最近,Domagoj Bradaimi,Oliver Janzer,Benny Sudakov和István Tomon证明了$2$维网格的Turán数是$Θ(n^{3/2})$,或者更一般地,$\mathrm{ex}\left(n,T\square{P}\right)=Θ(n^{3/2})$,其中$T$是非平凡树,$P$是非平凡路,$T\square{P}$表示笛卡儿积。在他们的证明中,他们展示了一种使用张量幂幂技巧的新方法,该技巧在图兰型问题中具有很大的潜力。在证明的最后,他们证明了非平凡树的$\mathrm{ex}\left(n,T\square{R}\right)=Θ(n^{3/2})$为$T$和$R$。本文是在他们工作的基础上的扩展,我们采用他们的方法成功地证明了上述猜想。

英文摘要:

Recently, Domagoj Bradač, Oliver Janzer, Benny Sudakov and István Tomon have proved that the Turán number of $2$-dimensional grids is $Θ(n^{3/2})$, or more general, $\mathrm{ex}\left(n,T\square{P}\right)=Θ(n^{3/2})$, where $T$ is a non-trivial tree, $P$ is a non-trivial path, and $T\square{P}$ denotes the Cartesian product. In their proof, they exhibited a novel way of using the tensor power trick, which has lots of potential in Turán type problems. By the end of their proof, they conjectured that $\mathrm{ex}\left(n,T\square{R}\right)=Θ(n^{3/2})$ for non-trivial trees $T$ and $R$. This paper is an extension based on their work, we successfully prove the above conjecture by adapting their approach.

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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