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On the chance-constrained minimum spanning k-core problem

Author

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  • Juan Ma

    (Turner Broadcasting System, Inc.)

  • Balabhaskar Balasundaram

    (Oklahoma State University)

Abstract

A graph is called a k-core if every vertex has at least k neighbors. If the parameter k is sufficiently large relative to the number of vertices, a k-core is guaranteed to possess 2-hop reachability between all pairs of vertices. Furthermore, it is guaranteed to preserve those pairwise distances under arbitrary single-vertex deletion. Hence, the concept of a k-core can be used to produce 2-hop survivable network designs, specifically to design inter-hub networks. Formally, given an edge-weighted graph, the minimum spanningk-core problem seeks a spanning subgraph of the given graph that is a k-core with minimum total edge weight. For any fixed k, this problem is equivalent to a generalized graph matching problem and can be solved in polynomial time. This article focuses on a chance-constrained version of the minimum spanning k-core problem under probabilistic edge failures. We first show that this probabilistic version is NP-hard, and we conduct a polyhedral study to strengthen the formulation. The quality of bounds produced by the strengthened formulation is demonstrated through a computational study.

Suggested Citation

  • Juan Ma & Balabhaskar Balasundaram, 2019. "On the chance-constrained minimum spanning k-core problem," Journal of Global Optimization, Springer, vol. 74(4), pages 783-801, August.
    • Handle: RePEc:spr:jglopt:v:74:y:2019:i:4:d:10.1007_s10898-018-0714-2
    DOI: 10.1007/s10898-018-0714-2
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    References listed on IDEAS

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