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204
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MFCS
2001
Springer
15 years 10 months ago
2001
Springer
We show that it is not possible to approximate the minimum Steiner tree problem within 1 + 1 162 unless RP = NP. The currently best known lower bound is 1 + 1 400. The reduction i...
127
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EOR
2006
15 years 6 months ago
2006
We introduce the two-stage stochastic maximum-weight matching problem and demonstrate that this problem is NP-complete. We give a factor 1 2 approximation algorithm and prove its ...
141
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MFCS
2005
Springer
15 years 11 months ago
2005
Springer
In the maximum solution equation problem a collection of equations are given over some algebraic structure. The objective is to find an assignment to the variables in the equation...
147
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FOCS
2008
IEEE
15 years 6 months ago
2008
IEEE
We present the first polynomial-time approximation algorithms for single-minded envy-free profit-maximization problems [13] with limited supply. Our algorithms return a pricing sc...
164
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IJKESDP
2010
15 years 4 months ago
2010
—This paper considers k-minimum spanning tree problems. An existing solution algorithm based on tabu search, which was proposed by Katagiri et al., includes an iterative solving ...