A note on maximum independent sets and minimum clique partitions in unit disk graphs and penny graphs: complexity and approximation

Marcia R. Cerioli; Luerbio Faria; Talita O. Ferreira; Fábio Protti

RAIRO - Theoretical Informatics and Applications (2011)

  • Volume: 45, Issue: 3, page 331-346
  • ISSN: 0988-3754

Abstract

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A unit disk graph is the intersection graph of a family of unit disks in the plane. If the disks do not overlap, it is also a unit coin graph or penny graph. It is known that finding a maximum independent set in a unit disk graph is a NP-hard problem. In this work we extend this result to penny graphs. Furthermore, we prove that finding a minimum clique partition in a penny graph is also NP-hard, and present two linear-time approximation algorithms for the computation of clique partitions: a 3-approximation algorithm for unit disk graphs and a 2-approximation algorithm for penny graphs.

How to cite

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Cerioli, Marcia R., et al. "A note on maximum independent sets and minimum clique partitions in unit disk graphs and penny graphs: complexity and approximation." RAIRO - Theoretical Informatics and Applications 45.3 (2011): 331-346. <http://eudml.org/doc/221997>.

@article{Cerioli2011,
abstract = { A unit disk graph is the intersection graph of a family of unit disks in the plane. If the disks do not overlap, it is also a unit coin graph or penny graph. It is known that finding a maximum independent set in a unit disk graph is a NP-hard problem. In this work we extend this result to penny graphs. Furthermore, we prove that finding a minimum clique partition in a penny graph is also NP-hard, and present two linear-time approximation algorithms for the computation of clique partitions: a 3-approximation algorithm for unit disk graphs and a 2-approximation algorithm for penny graphs. },
author = {Cerioli, Marcia R., Faria, Luerbio, Ferreira, Talita O., Protti, Fábio},
journal = {RAIRO - Theoretical Informatics and Applications},
keywords = {Unit disk graphs; unit coin graphs; penny graphs; independent set; clique partition; approximation algorithms; unit disk graphs; clique partition},
language = {eng},
month = {9},
number = {3},
pages = {331-346},
publisher = {EDP Sciences},
title = {A note on maximum independent sets and minimum clique partitions in unit disk graphs and penny graphs: complexity and approximation},
url = {http://eudml.org/doc/221997},
volume = {45},
year = {2011},
}

TY - JOUR
AU - Cerioli, Marcia R.
AU - Faria, Luerbio
AU - Ferreira, Talita O.
AU - Protti, Fábio
TI - A note on maximum independent sets and minimum clique partitions in unit disk graphs and penny graphs: complexity and approximation
JO - RAIRO - Theoretical Informatics and Applications
DA - 2011/9//
PB - EDP Sciences
VL - 45
IS - 3
SP - 331
EP - 346
AB - A unit disk graph is the intersection graph of a family of unit disks in the plane. If the disks do not overlap, it is also a unit coin graph or penny graph. It is known that finding a maximum independent set in a unit disk graph is a NP-hard problem. In this work we extend this result to penny graphs. Furthermore, we prove that finding a minimum clique partition in a penny graph is also NP-hard, and present two linear-time approximation algorithms for the computation of clique partitions: a 3-approximation algorithm for unit disk graphs and a 2-approximation algorithm for penny graphs.
LA - eng
KW - Unit disk graphs; unit coin graphs; penny graphs; independent set; clique partition; approximation algorithms; unit disk graphs; clique partition
UR - http://eudml.org/doc/221997
ER -

References

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