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arXiv 0801.3624cs.CC
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不相交的多方通信复杂性

Multiparty Communication Complexity of Disjointness

Arkadev Chattopadhyay, Anil Ada

摘要:

当k为常数时,我们得到了多方通信的"额上数“模型中不相交函数的k方随机通信复杂性的一个下界n^Ω(1).对于k=o(loglog n),边界保持超多对数,即(log n)^omega(1)。直到最近,三个参与者的最佳下界是Omega(log n)。我们的界分离了通信复杂性类NP^{CC}_k和BPP^{CC}_k,其中k=o(loglog n)。此外,利用Beame,Pitassi和Segerlind \cite{BPS07}的结果,我们的界包含了树型k-1阶门限系统的证明规模下界和Lovasz-Schrijver证明的超多项式规模下界. Sherstov \cite{She07b}最近开发了一种新的技术,使用布尔函数的近似多项式次数来获得两方通信的下界。我们得到了我们的结果,通过扩展他的技术,多方设置使用的想法从Chattopadhyay \cite{Cha07}。最近,Lee和Shraibman独立地获得了一个类似的不相交性界。

英文摘要:

We obtain a lower bound of n^Omega(1) on the k-party randomized communication complexity of the Disjointness function in the `Number on the Forehead' model of multiparty communication when k is a constant. For k=o(loglog n), the bounds remain super-polylogarithmic i.e. (log n)^omega(1). The previous best lower bound for three players until recently was Omega(log n). Our bound separates the communication complexity classes NP^{CC}_k and BPP^{CC}_k for k=o(loglog n). Furthermore, by the results of Beame, Pitassi and Segerlind \cite{BPS07}, our bound implies proof size lower bounds for tree-like, degree k-1 threshold systems and superpolynomial size lower bounds for Lovasz-Schrijver proofs. Sherstov \cite{She07b} recently developed a novel technique to obtain lower bounds on two-party communication using the approximate polynomial degree of boolean functions. We obtain our results by extending his technique to the multi-party setting using ideas from Chattopadhyay \cite{Cha07}. A similar bound for Disjointness has been recently and independently obtained by Lee and Shraibman.

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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