AA3 – Networks



Proximity of LP and IP solutions

Project Heads

Martin Henk

Project Members

Marcel Celaya (TU)

Project Duration

01.08.2019 – 31.12.2020

Located at

TU Berlin


A classic result of Cook et al. (1986) bounds the distances between optimal solutions of integer linear programs and optimal solutions of the corresponding linear relaxations. Their bound is the product of the dimension and a parameter Δ, which quantifies sub-determinants of the underlying linear inequalities. We intend to study this bound both, deterministically and probabilistically. In particular, in the deterministic setting we want to make the bound independent of the dimension.  This would be a first step to show that Δ is a fundamental parameter to make high dimensional integer linear optimization problems tractable.

Project Webpages

Selected Publications

  • I. Aliev, M. Henk, and T. Oertel. Integrality gaps of integer knapsack problems. In Integer programming and combinatorial optimization, volume 10328 of Lecture Notes in Comput. Sci., pages 25–38. Springer, Cham, 2017.
  • W. Cook, A.M.H. Gerards, A. Schrijver, and E. Tardos. Sensitivity theorems in integer linear programming. Math. Programming, 34(3):251–264, 1986.

  • F. Eisenbrand and R. Weismantel. Proximity results and faster algorithms for integer pro- gramming using the Steinitz lemma. In Proceedings of the Twenty-Ninth Annual ACM-SIAM Symposium on Discrete Algorithms, pages 808–816. SIAM, Philadelphia, PA, 2018.

Selected Pictures

Red dots are the integral optimal solutions whereas X* is the fractional optimal solution.

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