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SODA
2003
ACM
133views Algorithms» more  SODA 2003»
13 years 9 months ago
Integrality ratio for group Steiner trees and directed steiner trees
The natural relaxation for the Group Steiner Tree problem, as well as for its generalization, the Directed Steiner Tree problem, is a flow-based linear programming relaxation. We...
Eran Halperin, Guy Kortsarz, Robert Krauthgamer, A...
AAIM
2007
Springer
151views Algorithms» more  AAIM 2007»
14 years 1 months ago
Acyclic Edge Colouring of Outerplanar Graphs
An acyclic edge colouring of a graph is a proper edge colouring having no 2-coloured cycle, that is, a colouring in which the union of any two colour classes forms a linear forest...
Rahul Muthu, N. Narayanan, C. R. Subramanian
LICS
1997
IEEE
13 years 11 months ago
The Complexity of Subtype Entailment for Simple Types
A subtyping 0 is entailed by a set of subtyping constraints C, written C j= 0, if every valuation (mapping of type variables to ground types) that satisfies C also satisfies 0. ...
Fritz Henglein, Jakob Rehof
IPL
2006
115views more  IPL 2006»
13 years 7 months ago
Approximate maximum weight branchings
We consider a special subgraph of a weighted directed graph: one comprising only the k heaviest edges incoming to each vertex. We show that the maximum weight branching in this su...
Amitabha Bagchi, Ankur Bhargava, Torsten Suel
ICCD
2003
IEEE
109views Hardware» more  ICCD 2003»
14 years 4 months ago
Independent Test Sequence Compaction through Integer Programming
We discuss the compaction of independent test sequences for sequential circuits. Our first contribution is the formulation of this problem as an integer program, which we then so...
Petros Drineas, Yiorgos Makris