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arXiv 2102.01543math.COmath.NT
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van der Waerden数的新下界

New lower bounds for van der Waerden numbers

Ben Green

摘要:

我们发现,有一个红蓝色的$[N]$没有蓝色的3项等差数列,没有红色的等差数列长度$e^{C(\log N)^{3/4}(\log \log N)^{1/4}}$。因此,双色范德瓦尔登数$w(3,k)$由$k^{b(k)}$限定,其中$b(k) = c \big( \frac{\log k}{\log\log k} \big)^{1/3}$。以前曾推测,数据支持,$w(3,k) = O(k^2)$。

英文摘要:

We show that there is a red-blue colouring of $[N]$ with no blue 3-term arithmetic progression and no red arithmetic progression of length $e^{C(\log N)^{3/4}(\log \log N)^{1/4}}$. Consequently, the two-colour van der Waerden number $w(3,k)$ is bounded below by $k^{b(k)}$, where $b(k) = c \big( \frac{\log k}{\log\log k} \big)^{1/3}$. Previously it had been speculated, supported by data, that $w(3,k) = O(k^2)$.

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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