New Integer Programming Formulations of the Generalized Travelling Salesman Problem

New Integer Programming Formulations of the Generalized Travelling Salesman Problem

The Generalized Travelling Salesman Problem, denoted by GTSP, is a variant of the classical travelling salesman problem (TSP), in which the nodes of an undirected graph are partitioned into node sets (clusters) and the salesman has to visit exactly one node from every cluster. In this paper we described six distinct formulations of the GTSP as an integer programming. Apart from the standard for...

A Survey of Different Integer Programming Formulations of the Travelling Salesman Problem

Eight distinct (and in some cases little known) formulations of the Travelling Salesman Problem as an Integer Programme are given. Apart from the standard formulation all the formulations are ‘compact’ in the sense that the number of constraints and variables is a polynomial function of the number of cities in the problem. Comparisons of the formulations are made by projecting out variables in ...

Teaching Integer Programming Formulations Using the Traveling Salesman Problem

We designed a simple computational exercise to compare weak and strong integer programming formulations of the traveling salesman problem. Using commercial IP software, and a short (60 line long) MATLAB code, students can optimally solve instances with up to 70 cities in a few minutes by adding cuts from the stronger formulation to the weaker, but simpler one.

Applications and Formulations of the Travelling Salesman Problem

New Formulations for the Generalized Traveling Salesman Problem

The Generalized Traveling Salesman Problem (GTSP) is an extension of the well known Traveling Salesman Problem (TSP). The GTSP is defined on a graph in which the nodes (customers or vertices) are grouped into a given number of clusters (node sets). Solution procedures for the GTSP are generally focused on transforming the problem to the TSP and applying the exact or heuristic solution methods d...