Unambiguous DNFs and Alon-Saks-Seymour

Unambiguous DNFs and Alon-Saks-Seymour
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明确的 DNF 和阿隆-萨克斯-西摩

DOI:
10.1109/focs52979.2021.00020
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发表时间:
2021
期刊:
2021 IEEE 62nd Annual Symposium on Foundations of Computer Science (FOCS)
影响因子:
--
通讯作者:
Robin Kothari
Robin Kothari
中科院分区:
--
文献类型:
--
作者:
K. Balodis;S. Ben;Mika Goos;Siddhartha Jain;Robin Kothari

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我们展示了一个明确的$ k $ -dnf公式,它需要CNF宽度$ \ tilde \ omega(k^{2})$,这是最佳的,因此我们获得了对数的差异。 –saks - 图理论中的seymour问题(1991年提出),该问题问:差距在图形的色数及其双分区数之间有多大的差距?查询和通信复杂性的分离。
We exhibit an unambiguous $k$-DNF formula that requires CNF width $\tilde\Omega(k^{2})$, which is optimal up to logarithmic factors. As a consequence, we get a near-optimal solution to the Alon–Saks–Seymour problem in graph theory (posed in 1991), which asks: How large a gap can there be between the chromatic number of a graph and its biclique partition number? Our result is also known to imply several other improved separations in query and communication complexity.
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