arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.5010cs.DScs.DM
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测试无周期性:查找证书

Testing cycle-freeness: Finding a certificate

C. Seshadhri

摘要:

研究了有界度图无圈性的单侧误差性质测试器的设计问题。这样的属性测试器总是接受森林。此外,当它拒绝输入时,它提供一个短周期作为证书。在这个模型中检验无循环性的问题首先由Goldreich和Ron \cite{GR97}考虑。他们给出了一个具有双侧误差的恒定时间测试器(它不提供拒绝证书),并证明了具有单侧误差的测试器的$Ω(\sqrt{n})$下限。我们设计了一个具有单侧误差的属性测试器,其运行时间与此下限相匹配(至多为多对数因子)。有趣的是,这与Benjamini、Schramm和Shapira \cite{BSS08}最近提出的一个猜想有关。无周期性的属性在采取未成年人的操作下被关闭。这是具有几乎最佳的$\otilde(\sqrt{n})$时间单侧误差测试器但具有恒定时间双侧误差测试器的这种属性的第一个示例。在\cite{BSS08}中证明了这对于大量的次闭性质都是发生的,这个结果可以被看作是第一个迹象。

英文摘要:

We deal with the problem of designing one-sided error property testers for cycle-freeness in bounded degree graphs. Such a property tester always accepts forests. Furthermore, when it rejects an input, it provides a short cycle as a certificate. The problem of testing cycle-freeness in this model was first considered by Goldreich and Ron \cite{GR97}. They give a constant time tester with two-sided error (it does not provide certificates for rejection) and prove a $Ω(\sqrt{n})$ lower bound for testers with one-sided error. We design a property tester with one-sided error whose running time matches this lower bound (upto polylogarithmic factors). Interestingly, this has connections to a recent conjecture of Benjamini, Schramm, and Shapira \cite{BSS08}. The property of cycle-freeness is closed under the operation of taking minors. This is the first example of such a property that has an almost optimal $\otilde(\sqrt{n})$-time one-sided error tester, but has a constant time two-sided error tester. It was conjectured in \cite{BSS08} that this happens for a vast class of minor-closed properties, and this result can seen as the first indication towards that.

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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