105 search results - page 19 / 21 » A 3-Approximation for the Minimum Tree Spanning k Vertices |
DAM
2011
13 years 2 months ago
2011
We present a collection of new structural, algorithmic, and complexity results for two types of matching problems. The first problem involves the computation of k-maximal matchin...
ICALP
2009
Springer
14 years 8 months ago
2009
Springer
The algebraic framework introduced in [Koutis, Proc. of the 35th ICALP 2008] reduces several combinatorial problems in parameterized complexity to the problem of detecting multili...
IWPEC
2009
Springer
14 years 2 months ago
2009
Springer
Abstract. We introduce the graph parameter boolean-width, related to the number of different unions of neighborhoods across a cut of a graph. For many graph problems this number is...
SODA
1992
ACM
13 years 8 months ago
1992
ACM
We present a general approximation technique for a large class of graph problems. Our technique mostly applies to problems of covering, at minimum cost, the vertices of a graph wit...
ACID
2006
13 years 9 months ago
2006
We consider the concepts of a t-total vertex cover and a t-total edge cover (t 1), which generalize the notions of a vertex cover and an edge cover, respectively. A t-total verte...