A hierarchy of relaxation between the continuous and convex hull representations
SIAM Journal on Discrete Mathematics
Discrete Applied Mathematics
A polyhedral approach to the asymmetric traveling salesman problem
Management Science
Integer Programming Formulation of Traveling Salesman Problems
Journal of the ACM (JACM)
Discrete Applied Mathematics - Special issue on the combinatorial optimization symposium
Computational Optimization and Applications
Improvements and extensions to the Miller-Tucker-Zemlin subtour elimination constraints
Operations Research Letters
Compact vs. exponential-size LP relaxations
Operations Research Letters
Invited review: A comparative analysis of several asymmetric traveling salesman problem formulations
Computers and Operations Research
Tight compact models and comparative analysis for the prize collecting Steiner tree problem
Discrete Applied Mathematics
Natural and extended formulations for the Time-Dependent Traveling Salesman Problem
Discrete Applied Mathematics
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In this paper, we present a new class of polynomial length formulations for the asymmetric traveling salesman problem (ATSP) by lifting an ordered path-based model using logical restrictions in concert with the Reformulation-Linearization Technique (RLT). We show that a relaxed version of this formulation is equivalent to a flow-based ATSP model, which in turn is tighter than the formulation based on the exponential number of Dantzig-Fulkerson-Johnson (DFJ) subtour elimination constraints. The proposed lifting idea is applied to derive a variety of new formulations for the ATSP, and we explore several dominance relationships among these. We also extend these formulations to include precedence constraints in order to enforce a partial order on the sequence of cities to be visited in a tour. Computational results are presented to exhibit the relative tightness of our formulations and the efficacy of the proposed lifting process.