Random regular graphs with edge faults: expansion through cores

  • Authors:
  • Andreas Goerdt

  • Affiliations:
  • Fakultä:t fü:r Theoretische Informatik, Chemnitz, Germany

  • Venue:
  • Theoretical Computer Science
  • Year:
  • 2001

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Abstract

Let G be a given graph (modelling 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 Gitself 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 fixed d &le: 42 and p = k/d, k ≤ 20, a random regular graph with fault probability f = 1 - p contains a linear-size subgraph which is an expander almost surely. This subgraph can be found by a simple linear-time algorithm.