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Optimal Toll Design: A Lower Bound Framework for the Asymmetric Traveling Salesman Problem

Alejandro Toriello (toriello***at***usc.edu)

Abstract: We propose a framework of lower bounds for the asymmetric traveling salesman problem (TSP) based on approximating the dynamic programming formulation with diff erent basis vector sets. We discuss how several well-known TSP lower bounds correspond to intuitive basis vector choices and give an economic interpretation wherein the salesman must pay tolls as he travels between cities. We then introduce an exact reformulation that generates a family of successively tighter lower bounds, all solvable in polynomial time. We show that the base member of this family yields a bound greater than or equal to the well-known Held-Karp bound, obtained by solving the linear programming relaxation of the TSP's integer programming arc-based formulation.

Keywords: traveling salesman problem, dynamic program, approximate linear program, integer program, lower bound technique

Category 1: Combinatorial Optimization

Category 2: Integer Programming (0-1 Programming )

Category 3: Other Topics (Dynamic Programming )

Citation: Daniel J. Epstein Department of Industrial and Systems Engineering University of Southern California 3715 McClintock Avenue GER 240, Los Angeles, California 90089 October, 2011

Download: [PDF]

Entry Submitted: 10/28/2011
Entry Accepted: 10/29/2011
Entry Last Modified: 12/25/2012

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