One of the decisions in the construction of linear programs is upon the formulation which should be used. This paper explains why there is usually a very large number of equivalent formulations and reports on the computational behavior of these formulations. The usual textbook-hypothesis which...

A major decision in the development of optimization models concerns the degree of accuracy to be used in the model. In practica, this simplification decision is widely met in an ad hoc fashion. Recently, several ways of Computing (worst-case) bounds for simplifying linear programming (LP) models...

The problems of determining meaningful dual values and of per-forming meaningful sensitivity analysis in degenerate optima are reconsidered. For primal degenerate optima, earlier results on determining meaningful dual values are used to propose an effi-cient algorithm for determining meaningful...