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125
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IPL
2010
71views more  IPL 2010»
15 years 1 months ago
New common ancestor problems in trees and directed acyclic graphs
We derive a new generalization of lowest common ancestors (LCAs) in dags, called the lowest single common ancestor (LSCA). We show how to preprocess a static dag in linear time su...
Johannes Fischer, Daniel H. Huson
CPC
2010
88views more  CPC 2010»
15 years 26 days ago
Directed Graphs Without Short Cycles
Jacob Fox, Peter Keevash, Benny Sudakov
133
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DAGSTUHL
2007
15 years 4 months ago
Directed Feedback Vertex Set Problem is FPT
To decide if the parameterized feedback vertex set problem in directed graph is fixed-parameter tractable is a long standing open problem. In this paper, we prove that the paramet...
Jianer Chen, Yang Liu 0002, Songjian Lu
127
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SIAMDM
2000
103views more  SIAMDM 2000»
15 years 3 months ago
Directional Routing via Generalized st-Numberings
We present a mathematical model for network routing based on generating paths in a consistent direction. Our development is based on an algebraic and geometric framework for defini...
Fred S. Annexstein, Kenneth A. Berman