Lasserre Integrality Gaps for Graph Spanners and Related Problems

Lasserre Integrality Gaps for Graph Spanners and Related Problems
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图 Spanner 的 Lasserre 完整性差距及相关问题

DOI:
10.1007/978-3-030-80879-2_7
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发表时间:
2020
期刊:
International Workshop on Approximation and Online Algorithms (WAOA
影响因子:
--
通讯作者:
Zhang, Zeyu
Zhang, Zeyu
中科院分区:
--
文献类型:
--
作者:
Dinitz, Michael;Nazari, Yasamin;Zhang, Zeyu

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There has been significant recent progress on algorithms for approximating graph spanners, i.e., algorithms which approximate the best spanner for a given input graph. Essentially all of these algorithms use the same basic LP relaxation, so a variety of papers have studied the limitations of this approach and proved integrality gaps for this LP. We extend these results by showing that even the strongest lift-and-project methods cannot help significantly, by proving polynomial integrality gaps even forlevels of the Lasserre hierarchy, for both the directed and undirected spanner problems. We also extend these integrality gaps to related problems, notablyDirected Steiner NetworkandShallow-Light Steiner Network.
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