Non-Stanley Bounds for Network Reliability

  • Authors:
  • Jason I. Brown;Charles J. Colbourn

  • Affiliations:
  • Department of Mathematics, Statistics and Computing Science, Dalhousie University, Halifax, Canada;Department of Combinatorics and Optimization, University of Waterloo, Waterloo, Canada

  • Venue:
  • Journal of Algebraic Combinatorics: An International Journal
  • Year:
  • 1996

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Abstract

Suppose that each edge of a connected graph G of order n is independently operational with probability p; the reliability of G is the probability that the operational edges form a spanning connected subgraph. A useful expansion of the reliability is as p^{n-1} \sum_{i=0}^d\ H_i(1 \ - \ p)^i, and the Ball-Provan method for bounding reliability relies on Stanley's combinatorial bounds for the H-vectors of shellable complexes. We prove some new bounds here for the H-vectors arising from graphs, and the results here shed light on the problem of characterizing the H-vectors of matroids.