Greedy spanners are optimal in doubling metrics

Greedy spanners are optimal in doubling metrics
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贪婪扳手在加倍指标方面是最佳的

DOI:
10.1137/1.9781611975482.145
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发表时间:
2017
期刊:
ArXiv
影响因子:
--
通讯作者:
Christian Wulff
Christian Wulff
中科院分区:
--
文献类型:
--
作者:
G. Borradaile;Hung Le;Christian Wulff

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我们证明了贪婪算法构造了一个$(1+\mathrm)$-矩阵的权重为$\mathrm ^{-O(d)}w(\mathrm{MST})$的点集的度量的两倍$d$,解决了Gottlieb提出的一个公开问题。我们的结果推广了Narasimhan和Smid的结果,他们证明了d维欧氏空间中的一个点集有一个$(1+\n)$-权最多为$\n ^{-O(d)}w(\mathrm{MST})$。我们的证明只使用了双重度量的包装性质,从而意味着在欧几里得空间中对相同结果的证明要简单得多。
We show that the greedy spanner algorithm constructs a $(1+\epsilon)$-spanner of weight $\epsilon^{-O(d)}w(\mathrm{MST})$ for a point set in metrics of doubling dimension $d$, resolving an open problem posed by Gottlieb. Our result generalizes the result by Narasimhan and Smid who showed that a point set in $d$-dimension Euclidean space has a $(1+\epsilon)$-spanner of weight at most $\epsilon^{-O(d)}w(\mathrm{MST})$. Our proof only uses the packing property of doubling metrics and thus implies a much simpler proof for the same result in Euclidean space.