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arXiv 1104.3090cs.DS
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图形TSP的匹配逼近

Approximating Graphic TSP by Matchings

Tobias Mömke, Ola Svensson

摘要:

我们提出了一个框架,近似度量TSP的基础上使用一种新的匹配。传统上,匹配已被用来添加边缘,以使一个给定的图欧拉,而我们的方法也允许删除某些边缘,从而降低成本。对于图度量上的TSP(graph-TSP),该方法给出了关于Held-Karp下界的1.461-近似算法.对于图-TSP限制到一类图,其中包含度3有界和无爪图,我们证明了Held-Karp松弛的完整性间隙匹配的压缩比4/3。该框架允许在一个自然的方式进行概括,也导致了1.586-近似算法的旅行推销员路径问题的图形度量的开始和结束顶点预先指定。

英文摘要:

We present a framework for approximating the metric TSP based on a novel use of matchings. Traditionally, matchings have been used to add edges in order to make a given graph Eulerian, whereas our approach also allows for the removal of certain edges leading to a decreased cost. For the TSP on graphic metrics (graph-TSP), the approach yields a 1.461-approximation algorithm with respect to the Held-Karp lower bound. For graph-TSP restricted to a class of graphs that contains degree three bounded and claw-free graphs, we show that the integrality gap of the Held-Karp relaxation matches the conjectured ratio 4/3. The framework allows for generalizations in a natural way and also leads to a 1.586-approximation algorithm for the traveling salesman path problem on graphic metrics where the start and end vertices are prespecified.

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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