On the Complexity of Four Polyhedral Set Containment Problems (Classic Reprint)

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Excerpt from On the Complexity of Four Polyhedral Set Containment ProblemsA nonempty closed convex polyhedron X can be represented either in the form X where (a, b) are given, in which case X is called an H - cell (h for halfspaces), or in the form X where (u, v) are given, in which case X is called a w - cell (w for weighting of points). The computational complexity of many problems related to polyhedra depend on the polyhedral representation as an H-cell or a W-cell. For example, consider a linear program, which can be stated as maximize ctx subject xex, where X is a polyhedron. If X is an H - cell, this is the usual linear program, whose solution time, while polynomial, is by no means negligible. However, if X is represented as a W-cell, the linear programming problem becomes trivial. As another example, consider the problem of testing if xex for a given E, where X is a polyhedron. If X is an H-cell, the problem is trivial, whereas if X is a w-cell, the problem reduces to solving a linear program.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.