[HTML][HTML] A class of lifted path and flow-based formulations for the asymmetric traveling salesman problem with and without precedence constraints

HD Sherali, SC Sarin, PF Tsai - Discrete Optimization, 2006 - Elsevier
Discrete Optimization, 2006Elsevier
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 …
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.
Elsevier
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