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COLOGNETWENTE
2010
15 years 5 months ago
Approximating Independent Set in Semi-Random Graphs
We present an algorithm for the independent set problem on semi-random graphs, which are generated as follows: An adversary chooses an n-vertex graph, and then each edge is flipp...
Bodo Manthey, Kai Plociennik
STOC
2006
ACM
113views Algorithms» more  STOC 2006»
16 years 1 months ago
Logarithmic hardness of the directed congestion minimization problem
We show that for any constant ε > 0, there is no Ω(log1−ε M)approximation algorithm for the directed congestion minimization problem on networks of size M unless NP ⊆ Z...
Matthew Andrews, Lisa Zhang
WADS
2005
Springer
108views Algorithms» more  WADS 2005»
16 years 19 days ago
Improved Fixed-Parameter Algorithms for Two Feedback Set Problems
Abstract. Settling a ten years open question, we show that the NPcomplete Feedback Vertex Set problem is deterministically solvable in O(ck ·m) time, where m denotes the number of...
Jiong Guo, Jens Gramm, Falk Hüffner, Rolf Nie...
SIAMCO
2008
80views more  SIAMCO 2008»
15 years 7 months ago
Optimal Transportation Problem by Stochastic Optimal Control
We solve optimal transportation problem using stochastic optimal control theory. Indeed, for a super linear cost at most quadratic at infinity, we prove Kantorovich duality theore...
Toshio Mikami, Michèle Thieullen
SIAMCOMP
2000
118views more  SIAMCOMP 2000»
15 years 7 months ago
On Bipartite Drawings and the Linear Arrangement Problem
The bipartite crossing number problem is studied, and a connection between this problem and the linear arrangement problem is established. It is shown that when the arboricity is ...
Farhad Shahrokhi, Ondrej Sýkora, Lás...