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Finding independent transversals efficiently

Part of: Graph theory

Published online by Cambridge University Press:  14 May 2020

Alessandra Graf  and
Penny Haxell
Alessandra Graf*
Affiliation:
Department of Combinatorics and Optimization, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
Penny Haxell
Affiliation:
Department of Combinatorics and Optimization, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
*
*Corresponding author. Email: agraf@uwaterloo.ca
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Abstract

We give an efficient algorithm that, given a graph G and a partition V1,…,Vm of its vertex set, finds either an independent transversal (an independent set {v1,…,vm} in G such that ${v_i} \in {V_i}$ for each i), or a subset ${\cal B}$ of vertex classes such that the subgraph of G induced by $\bigcup\nolimits_{\cal B}$ has a small dominating set. A non-algorithmic proof of this result has been known for a number of years and has been used to solve many other problems. Thus we are able to give algorithmic versions of many of these applications, a few of which we describe explicitly here.

MSC classification

Primary: 05C69: Dominating sets, independent sets, cliques
Secondary: 05C85: Graph algorithms
Type
Paper
Information
Combinatorics, Probability and Computing , Volume 29 , Issue 5 , September 2020 , pp. 780 - 806
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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