Trimmed moebius inversion and graphs of bounded degree

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceeding

Abstract

We study ways to expedite Yates's algorithm for computing the zeta and Moebius transforms of a function defined on the subset lattice. We develop a trimmed variant of Moebius inversion that proceeds point by point, finishing the calculation at a subset before considering its supersets. For an n-element universe U and a family F of its subsets, trimmed Moebius inversion allows us to compute the number of parkings, coverings, and partitions of U with k sets from F in time within a polynomial factor (in n) of the number of supersets of the members of F. Relying on an intersection theorem of Chung et al. (1986) to bound the sizes of set families, we apply these ideas to well-studied combinatorial optimisation problems on graphs of maximum degree A. In particular, we show how to compute the Domatic Number in time within a polynomial factor of (2(Delta+1) - 2)(n/(Delta+1)) and the Chromatic Number in time within a polynomial factor of (2(Delta+1) - Delta - 1)(n/(Delta+1)) For any constant A, these bounds are 0 ((2 - epsilon)(n)) for epsilon > 0 independent of the number of vertices n.

Detaljer

Författare
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Datavetenskap (datalogi)
Originalspråkengelska
Titel på värdpublikationSTACS 2008: Proceedings of the 25th Annual Symposium on Theoretical Aspects of Computer Science
FörlagLABRI - Laboratoire Bordelais de Recherche en Informatique
Sidor85-96
StatusPublished - 2008
PublikationskategoriForskning
Peer review utfördJa
Evenemang25th International Symposium on Theoretical Aspects of Computer Science (STACS 2008) - Bordeaux, Frankrike
Varaktighet: 2008 feb 212008 feb 23

Konferens

Konferens25th International Symposium on Theoretical Aspects of Computer Science (STACS 2008)
LandFrankrike
OrtBordeaux
Period2008/02/212008/02/23