Fault-Tolerant Geometric Spanners

  • Authors:
  • Artur Czumaj;Hairong Zhao

  • Affiliations:
  • Department of Computer Science, New Jersey Institute of Technology, Newark, NJ 07102, USA;Department of Computer Science, New Jersey Institute of Technology, Newark, NJ 07102, USA

  • Venue:
  • Discrete & Computational Geometry
  • Year:
  • 2004

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Abstract

We present two new results about vertex and edge fault-tolerant spanners in Euclidean spaces.We describe the first construction of vertex and edge fault-tolerant spanners having optimal bounds for maximum degree and total cost. We present a greedy algorithm that for any t 1 and any non-negative integer k, constructs a k-fault-tolerant t-spanner in which every vertex is of degree O(k) and whose total cost is O(k2) times the cost of the minimum spanning tree; these bounds are asymptotically optimal.Our next contribution is an efficient algorithm for constructing good fault-tolerant spanners. We present a new, sufficient condition for a graph to be a k-fault-tolerant spanner. Using this condition, we design an efficient algorithm that finds fault-tolerant spanners with asymptotically optimal bound for the maximum degree and almost optimal bound for the total cost.