Robust independence systems

Naonori Kakimura, Kazuhisa Makino

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


An independence system F is one of the most fundamental combinatorial concepts, which includes a variety of objects in graphs and hypergraphs such as matchings, stable sets, and matroids. We discuss the robustness for independence systems, which is a natural generalization of the greedy property of matroids. For a real number α > 0, a set X ∈ F is said to be α-robust if for any k, it includes an α-approximation of the maximum k-independent set, where a set Y in F is called k-independent if the size |Y | is at most k. In this paper, we show that every independence system has a 1/√μ(F)- robust independent set, where μ(F) denotes the exchangeability of F. Our result contains a classical result for matroids and the ones of Hassin and Rubinstein [SIAM J. Discrete Math., 15 (2002), pp. 530-537] for matchings and Fujita, Kobayashi, and Makino [SIAM J. Discrete Math., 27 (2013), pp. 1234-1256] for matroid 2-intersections, and provides better bounds for the robustness for many independence systems such as b-matchings, hypergraph matchings, matroid pintersections, and unions of vertex disjoint paths. Furthermore, we provide bounds of the robustness for nonlinear weight functions such as submodular and convex quadratic functions. We also extend our results to independence systems in the integral lattice with separable concave weight functions.

Original languageEnglish
Pages (from-to)1257-1273
Number of pages17
JournalSIAM Journal on Discrete Mathematics
Issue number3
Publication statusPublished - 2013
Externally publishedYes


  • Exchangeability
  • Independence systems
  • Matroids
  • Robustness

ASJC Scopus subject areas

  • Mathematics(all)


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