Studies two algorithms in detail: the ellipsoid method and the simultaneous diophantine approximation method.
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Describes use of the simultaneous diophantine method to develop sophisticated rounding procedures. Then a model is described to compute upper and lower bounds on various measures of convex bodies. Use of the two algorithms is brought together by the author in a study of polyhedra with rational vertices.
How to Round Numbers; Preliminaries: On Algorithms Involving Numbers; Diophantine Approximation, Problems; Lattices, Bases, and the Reduction Problem; Diophantine Approximation and Rounding; What is a Real Number How to Round a Convex Body; Preliminaries: Inputting a Set; Algorithmic Problems on Convex Sets; The Ellipsoid Method; Rational Polyhedra; Some Other Algorithmic Problems on Convex Sets; Integer Programming in Fixed Dimension; Some Applications in Combinatorics; Cuts and Joins; Chromatic Number, Cliques and Perfect Graphs; Minimizing a Submodular Function.
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