Fault-Tolerant Edge-Disjoint s-t Paths - Beyond Uniform Faults

Authors David Adjiashvili, Felix Hommelsheim , Moritz Mühlenthaler , Oliver Schaudt

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Author Details

David Adjiashvili
  • Department of Mathematics, ETH Zürich, Switzerland
Felix Hommelsheim
  • Department of Mathematics and Computer Science, Universität Bremen, Germany
Moritz Mühlenthaler
  • Laboratoire G-SCOP, Grenoble INP, Univ. Grenoble-Alpes, France
Oliver Schaudt
  • Department of Mathematics, RWTH Aachen University, Germany

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David Adjiashvili, Felix Hommelsheim, Moritz Mühlenthaler, and Oliver Schaudt. Fault-Tolerant Edge-Disjoint s-t Paths - Beyond Uniform Faults. In 18th Scandinavian Symposium and Workshops on Algorithm Theory (SWAT 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 227, pp. 5:1-5:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)


The Edge-disjoint s-t Paths Problem (s-t EDP) is a classical network design problem whose goal is to connect for some k ≥ 1 two given vertices of a graph under the condition that any k-1 edges of the graph may fail. We extend the simple uniform failure model of the s-t EDP as follows: the edge set of the graph is partitioned into vulnerable, and safe edges, and a set of at most k vulnerable edges may fail, while safe edges do not fail. In particular we study the Fault-Tolerant Path (FTP) problem, the counterpart of the Shortest s-t Path problem in this non-uniform failure model as well as the Fault-Tolerant Flow (FTF) problem, the counterpart of s-t EDP. We present complexity results alongside exact and approximation algorithms for both problems. We emphasize the vast increase in complexity of the problems compared to s-t EDP.

Subject Classification

ACM Subject Classification
  • Theory of computation → Routing and network design problems
  • Theory of computation → Network flows
  • Mathematics of computing → Approximation algorithms
  • graph algorithms
  • network design
  • fault tolerance
  • approximation algorithms


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