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Degree-bounded minimum spanning trees

机译:度限最小生成树

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Given n points in the Euclidean plane, the degree- minimum spanning tree (MST) problem asks for a spanning tree of minimum weight in which the degree of each vertex is at most . The problem is NP-hard for 2 3, while the NP-hardness of the problem is open for D 4. The problem is polynomial-time solvable when D 5. By presenting an improved approximation analysis for Chan’s degree-4 MST algorithm [T. Chan, Euclidean boundeddegree spanning tree ratios, Discrete & Computational Geometry 32 (2004) 177–194], we show that, for any arbitrary collection of p oints in the Euclidean plane, there always exists a degree-4 spanning tree of weight at most . p 2 C 2/=3 < 1:1381 times the weight of an MST.
机译:给定欧几里得平面中的n个点,最小度生成树(MST)问题要求最小权重的生成树,其中每个顶点的度最大为。对于2 3,问题是NP困难的,而对于D 4是问题的NP困难的。当D 5时,问题是多项式时间可解决的。通过对Chan的4级MST算法[T提出改进的近似分析。 Chan,欧几里得有界度生成树比率,Discrete&Computational Geometry 32(2004)177–194],我们表明,对于欧几里得平面中任意点的点集,总存在最多4次权重的生成树。 p 2 C 2 / = 3 <1:1381乘以MST的重量。

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