A note on the dual description of projected polytopes

Oliver Stein

Abstract. The inequalities which describe the projection $Q$ of a given polytope $P$ onto a subspace are usually generated by an elimination procedure of Fourier-Motzkin type. In this note we give a dual approach for the description of $Q$. In fact, the vertices of a dual polytope serve as indices for the describing inequalities. Moreover we show how the redundancy of inequalities is connected with the existence of Slater points in the images of a set-valued mapping.

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