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IPL
2010
71views more  IPL 2010»
13 years 6 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»
13 years 5 months ago
Directed Graphs Without Short Cycles
Jacob Fox, Peter Keevash, Benny Sudakov
DAGSTUHL
2007
13 years 9 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
SIAMDM
2000
103views more  SIAMDM 2000»
13 years 7 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