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• W2900806478 abstract "Miller et al. [48] devised a distributed 1 algorithm in the CONGEST model that, given a parameter k = 1,2,…, constructs an O ( k )-spanner of an input unweighted n -vertex graph with O ( n 1+1/ k ) expected edges in O ( k ) rounds of communication. In this article, we improve the result of Reference [48] by showing a k -round distributed algorithm in the same model that constructs a (2 k −1)-spanner with O ( n 1+1/ k }/ϵ) edges, with probability 1−ϵ for any ϵ>0. Moreover, when k =ω(log n ), our algorithm produces (still in k rounds) ultra-sparse spanners, i.e., spanners of size n (1+ o (1)), with probability 1− o (1). To our knowledge, this is the first distributed algorithm in the CONGEST or in the PRAM models that constructs spanners or skeletons (i.e., connected spanning subgraphs) that are sparse. Our algorithm can also be implemented in linear time in the standard centralized model, and for large k , it provides spanners that are sparser than any other spanner given by a known (near-)linear time algorithm. We also devise improved bounds (and algorithms realizing these bounds) for (1+ϵ, β)-spanners and emulators. In particular, we show that for any unweighted n -vertex graph and any ϵ > 0, there exists a (1+ ϵ, (log log n / ϵ) log log n )-emulator with O ( n ) edges. All previous constructions of (1+ϵ, β)-spanners and emulators employ a superlinear number of edges for all choices of parameters. Finally, we provide some applications of our results to approximate shortest paths’ computation in unweighted graphs." @default.
• W2900806478 created "2018-11-29" @default.
• W2900806478 creator A5066182501 @default.
• W2900806478 creator A5075683085 @default.
• W2900806478 date "2018-11-16" @default.
• W2900806478 modified "2023-10-13" @default.
• W2900806478 title "Efficient Algorithms for Constructing Very Sparse Spanners and Emulators" @default.
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• W2900806478 doi "https://doi.org/10.1145/3274651" @default.
• W2900806478 hasPublicationYear "2018" @default.
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