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Two algorithms for general list matrix partitions

Content Provider	ACM Digital Library
Author	Feder, Tomás Sgall, Jiří Hell, Pavol Král, Daniel
Abstract	List matrix partitions are restricted binary list constraint satisfaction problems which generalize list homomorphisms and many graph partition problems arising, e.g., in the study of perfect graphs. Most of the existing algorithms apply to concrete small matrices, i.e., to partitions into a small number of parts. We focus on two general classes of partition problems, provide algorithms for their solution, and discuss their implications.The first is an $O(n^{r+2})-algorithm$ for the list M-partition problem where M is any r by r matrix over subsets of {0, 1}, which has the "bisplit property". This algorithm can be applied to recognize so-called k-bisplit graphs in polynomial time, yielding a solution of an open problem from [2].The second is an algorithm running in time (rn)O(log r log n/log log $n)}n^{O}(log^{2}r)$ for the list M-partition problem where M is any r × r matrix over subsets of {0,1,.,q- 1}, with the "incomplete property". This algorithm applies to all non-NP-complete list M-partition problems with r = 3, and it improves the running time of the quasi-polynomial algorithm for the "stubborn problem" from [5], and for the "edge-free three-coloring problem" from [12].
Starting Page	870
Ending Page	876
Page Count	7
File Format	PDF
ISBN	0898715857
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-01-23
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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