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arXiv 1406.3597cs.GT
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无向网络设计对策稳定代价的$H_{n/2}$上界

An $H_{n/2}$ Upper Bound on the Price of Stability of Undirected Network Design Games

Akaki Mamageishvili, Matúš Mihalák, Simone Montemezzani

摘要:

在有$n$参与者的网络设计游戏中,每个参与者在边加权图中选择一条路径来连接她的终端对,与所有其他参与者公平地分担她路径上的边的成本。我们研究了博弈稳定性的代价,即,最佳纳什均衡的社会成本(相对于社会成本)与最优策略的社会成本之比。已经表明,任何网络设计游戏的稳定性的代价最多是$H_n$,即$n$的谐波数。这个界对于有向图是紧的。对于无向图来说,情况就大不相同了,紧边界是未知的。直到最近才表明,稳定性的代价最多是$H_n \left(1-\frac{1}{Θ(n^4)} \right)$,而已知的最坏情况的例子具有大约2.25的稳定性代价。在本文中,我们大大提高了上限,表明稳定的价格是最多$H_{n/2} + ε$的任何$ε$从一些合适的$n \geq n(ε)$。

英文摘要:

In the network design game with $n$ players, every player chooses a path in an edge-weighted graph to connect her pair of terminals, sharing costs of the edges on her path with all other players fairly. We study the price of stability of the game, i.e., the ratio of the social costs of a best Nash equilibrium (with respect to the social cost) and of an optimal play. It has been shown that the price of stability of any network design game is at most $H_n$, the $n$-th harmonic number. This bound is tight for directed graphs. For undirected graphs, the situation is dramatically different, and tight bounds are not known. It has only recently been shown that the price of stability is at most $H_n \left(1-\frac{1}{Θ(n^4)} \right)$, while the worst-case known example has price of stability around 2.25. In this paper we improve the upper bound considerably by showing that the price of stability is at most $H_{n/2} + ε$ for any $ε$ starting from some suitable $n \geq n(ε)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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