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On Multipartition Communication Complexity

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Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 2010))

Abstract

We study k-partition communication protocols, an extension of the standard two-party best-partition model to k input partitions. The main results are as follows.

  1. 1.

    A strong explicit hierarchy on the degree of non-obliviousness is established by proving that, using k+1 partitions instead of k may decrease the commu- nication complexity from θ (n) to θ (log k).

  2. 2.

    Certain linear codes are hard for k-partition protocols even when k may be exponentially large (in the input size). On the other hand, one can show that all characteristic functions of linear codes are easy for randomized OBDDs.

  3. 3.

    It is proven that there are subfunctions of the triangle-freeness function and the function ⊕ CLIQUEn,3 which are hard for multipartition protocols. As an application, truly exponential lower bounds on the size of nondeterministic read-once branching programs for these functions are obtained, solving an open problem of Razborov [17].

The work of the first and second author has been supported by DFG grant Hr 14/3-2, and of the fourth author by DFG grant We 1066/9-1.

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Ďuriš, P., Hromkovič, J., Jukna, S., Sauerhoff, M., Schnitger, G. (2001). On Multipartition Communication Complexity. In: Ferreira, A., Reichel, H. (eds) STACS 2001. STACS 2001. Lecture Notes in Computer Science, vol 2010. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44693-1_18

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  • DOI: https://doi.org/10.1007/3-540-44693-1_18

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  • Print ISBN: 978-3-540-41695-1

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