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Computing the Partition Function for Perfect Matchings in a Hypergraph

Published online by Cambridge University Press:  17 October 2011

ALEXANDER BARVINOK
Affiliation:
Department of Mathematics, University of Michigan, Ann Arbor, MI 48109-1043, USA (e-mail: barvinok@umich.edu)
ALEX SAMORODNITSKY
Affiliation:
Department of Computer Science, Hebrew University of Jerusalem, Givat Ram Campus, 91904, Israel (e-mail: salex@cs.huji.ac.il)
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Abstract

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Given non-negative weights wS on the k-subsets S of a km-element set V, we consider the sum of the products wS1 ⋅⋅⋅ wSm over all partitions V = S1 ∪ ⋅⋅⋅ ∪Sm into pairwise disjoint k-subsets Si. When the weights wS are positive and within a constant factor of each other, fixed in advance, we present a simple polynomial-time algorithm to approximate the sum within a polynomial in m factor. In the process, we obtain higher-dimensional versions of the van der Waerden and Bregman–Minc bounds for permanents. We also discuss applications to counting of perfect and nearly perfect matchings in hypergraphs.

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Paper
Copyright
Copyright © Cambridge University Press 2011