Random Regular Graphs with Edge Faults: Expansion through Cores

  • Authors:
  • Andreas Goerdt

  • Affiliations:
  • -

  • Venue:
  • ISAAC '98 Proceedings of the 9th International Symposium on Algorithms and Computation
  • Year:
  • 1998

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Abstract

Let G be a given graph (modeling a communication network) which we assume suffers from static edge faults: That is we let each edge of G be present independently with probability p (or absent with fault probability f = 1-p). In particular we are interested in robustness results for the case that the graph G itself is a random member of the class of all regular graphs with given degree d. Here we deal with expansion properties of faulty random regular graphs and show: For d ≥ 42, fixed and p = κ/d, κ ≥ 20, a random regular graph with fault probability f = 1- p contains a linear-sized subgraph which is an expander almost surely. This subgraph can be found by a simple linear-time algorithm.