SOLVING THE TRAVELING REPAIRMAN PROBLEM WITH DIFFERENTIATED WAITING TIMES THROUGH LAGRANGIAN RELAXATION

In this paper we present a formulation of the traveling repairman problem with difierentiated waiting times that is derived from the extended disaggregated ∞ow formulation for the asymmetric traveling salesman problem. We focus on the usage of the Lagrangian approach as a mechanism of speeding up the solution of the linear relaxation by a simplex method. We show some computational results.