55 search results - page 9 / 11 » A class of perfectly contractile graphs |
FOCS
2009
IEEE
14 years 2 months ago
2009
IEEE
—We introduce a new tool for approximation and testing algorithms called partitioning oracles. We develop methods for constructing them for any class of bounded-degree graphs wit...
SAT
2007
Springer
14 years 1 months ago
2007
Springer
Abstract. In this paper we study NP-hard weighted satisfiability optimization problems for the class 2-CNF providing worst-case upper time bounds. Moreover we consider the monoton...
JCT
2008
13 years 7 months ago
2008
We consider the question of characterizing Pfaffian graphs. We exhibit an infinite family of non-Pfaffian graphs minimal with respect to the matching minor relation. This is in sha...
ICALP
2009
Springer
14 years 7 months ago
2009
Springer
A graph is chordal if it does not contain any induced cycle of size greater than three. An alternative characterization of chordal graphs is via a perfect elimination ordering, whi...
CORR
2010
Springer
13 years 7 months ago
2010
Springer
We study problems of reconguration of shortest paths in graphs. We prove that the shortest reconguration sequence can be exponential in the size of the graph and that it is NP-hard...