NDLI: Decomposition, approximation, and coloring of odd-minor-free graphs

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Decomposition, approximation, and coloring of odd-minor-free graphs

Content Provider	ACM Digital Library
Author	Kawarabayashi, Ken-ichi Demaine, Erik D. Hajiaghayi, MohammadTaghi
Abstract	We prove two structural decomposition theorems about graphs excluding a fixed odd minor H, and show how these theorems can be used to obtain approximation algorithms for several algorithmic problems in such graphs. Our decomposition results provide new structural insights into odd-H-minor-free graphs, on the one hand generalizing the central structural result from Graph Minor Theory, and on the other hand providing an algorithmic decomposition into two bounded-treewidth graphs, generalizing a similar result for minors. As one example of how these structural results conquer difficult problems, we obtain a polynomial-time 2-approximation for vertex coloring in odd-H-minor-free graphs, improving on the previous O(\|V (H)\|)-approximation for such graphs and generalizing the previous 2-approximation for H-minor-free graphs. The class of odd-H-minor-free graphs is a vast generalization of the well-studied H-minor-free graph families and includes, for example, all bipartite graphs plus a bounded number of apices. Odd-H-minor-free graphs are particularly interesting from a structural graph theory perspective because they break away from the sparsity of H-minor-free graphs, permitting a quadratic number of edges.
Starting Page	329
Ending Page	344
Page Count	16
File Format	PDF
ISBN	9780898716986
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-01-17
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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