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The Lagrangian Relaxation Method for Solving Integer Programming Problems

Author

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  • Marshall L. Fisher

    (University of Pennsylvania, Philadelphia, Pennsylvania)

Abstract

(This article originally appeared in Management Science, January 1981, Volume 27, Number 1, pp. 1--18, published by The Institute of Management Sciences.) One of the most computationally useful ideas of the 1970s is the observation that many hard integer programming problems can be viewed as easy problems complicated by a relatively small set of side constraints. Dualizing the side constraints produces a Lagrangian problem that is easy to solve and whose optimal value is a lower bound (for minimization problems) on the optimal value of the original problem. The Lagrangian problem can thus be used in place of a linear programming relaxation to provide bounds in a branch and bound algorithm. This approach has led to dramatically improved algorithms for a number of important problems in the areas of routing, location, scheduling, assignment and set covering. This paper is a review of Lagrangian relaxation based on what has been learned in the last decade.

Suggested Citation

  • Marshall L. Fisher, 2004. "The Lagrangian Relaxation Method for Solving Integer Programming Problems," Management Science, INFORMS, vol. 50(12_supple), pages 1861-1871, December.
    • Handle: RePEc:inm:ormnsc:v:50:y:2004:i:12_supplement:p:1861-1871
    DOI: 10.1287/mnsc.1040.0263
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    References listed on IDEAS

    as
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    9. CORNUEJOLS, Gérard & FISHER, Marshall L. & NEMHAUSER, George L., 1977. "Location of bank accounts to optimize float: An analytic study of exact and approximate algorithms," LIDAM Reprints CORE 292, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
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