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69
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DM
1998
91views more  DM 1998»
14 years 9 months ago
On some relations between 2-trees and tree metrics
A tree function (TF) t on a ÿnite set X is a real function on the set of the pairs of elements of X satisfying the four-point condition: for all distinct x; y; z; w ∈ X; t(xy)+...
Bruno Leclerc, Vladimir Makarenkov
APPROX
2005
Springer
131views Algorithms» more  APPROX 2005»
15 years 3 months ago
Approximation Schemes for Node-Weighted Geometric Steiner Tree Problems
Abstract. In this paper we introduce a new technique for approximation schemes for geometrical optimization problems. As an example problem, we consider the following variant of th...
Jan Remy, Angelika Steger
AMAI
1999
Springer
14 years 9 months ago
STCSP - Structured Temporal Constraint satisfaction Problems
Temporal Constraint Satisfaction Problems (TCSP) is a well known approach for representing and processing temporal knowledge. Important properties of the knowledge can be inferred...
Mira Balaban, Tzachi Rosen
FOCS
2003
IEEE
15 years 3 months ago
Paths, Trees, and Minimum Latency Tours
We give improved approximation algorithms for a variety of latency minimization problems. In particular, we give a 3.591 -approximation to the minimum latency problem, improving o...
Kamalika Chaudhuri, Brighten Godfrey, Satish Rao, ...
62
Voted
CIE
2007
Springer
15 years 1 months ago
Definability in the Homomorphic Quasiorder of Finite Labeled Forests
Abstract. We prove that for any k 3 each element of the homomorphic quasiorder of finite k-labeled forests is definable, provided that the minimal non-smallest elements are allowe...
Oleg V. Kudinov, Victor L. Selivanov