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Partition Arguments in Multiparty Communication Complexity

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Automata, Languages and Programming (ICALP 2009)

Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 5555))

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Abstract

Consider the “Number in Hand” multiparty communication complexity model, where k players P 1,...,P k holding inputs \(x_1,\ldots,x_k\in{0, 1}^n\) (respectively) communicate in order to compute the value f(x 1,...,x k ). The main lower bound technique for the communication complexity of such problems is that of partition arguments: partition the k players into two disjoint sets of players and find a lower bound for the induced two-party communication complexity problem. In this paper, we study the power of the partition arguments method. Our two main results are very different in nature:

(i) For randomized communication complexity we show that partition arguments may be exponentially far from the true communication complexity. Specifically, we prove that there exists a 3-argument function f whose communication complexity is Ω(n) but partition arguments can only yield an Ω(log n) lower bound. The same holds for nondeterministic communication complexity.

(ii) For deterministic communication complexity, we prove that finding significant gaps, between the true communication complexity and the best lower bound that can be obtained via partition arguments, would imply progress on (a generalized version of) the “log rank conjecture” of communication complexity.

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Draisma, J., Kushilevitz, E., Weinreb, E. (2009). Partition Arguments in Multiparty Communication Complexity. In: Albers, S., Marchetti-Spaccamela, A., Matias, Y., Nikoletseas, S., Thomas, W. (eds) Automata, Languages and Programming. ICALP 2009. Lecture Notes in Computer Science, vol 5555. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02927-1_33

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  • DOI: https://doi.org/10.1007/978-3-642-02927-1_33

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-02926-4

  • Online ISBN: 978-3-642-02927-1

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