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    ORL
    2008
    91views more  ORL 2008»
    On the integrality ratio for tree augmentation
    13 years 4 months ago
    On the integrality ratio for tree augmentation
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    We show that the standard linear programming relaxation for the tree augmentation problem in undirected graphs has an integrality ratio that approaches 3 2 . This refutes a conjec...
    Joseph Cheriyan, Howard J. Karloff, Rohit Khandeka...
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    SODA
    2003
    ACM
    133views Algorithms» more  SODA 2003»
    Integrality ratio for group Steiner trees and directed steiner trees
    13 years 5 months ago
    Integrality ratio for group Steiner trees and directed steiner trees
    Download  www.cs.umd.edu
    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...
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