An Algorithm for Computing the Symmetry Point of a Polytope
Name
HPCES021.pdf
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10.84 KB
Format
Adobe PDF
Checksum (MD5)
b047ae7aba0bf1b00c0fef995bdb8781
Author(s)
Belloni, Alexandre
Freund, Robert M.
Date Issued
January 2004
Series/Report no.
High Performance Computation for Engineered Systems (HPCES);
Abstract
Given a closed convex set C and a point x in C, let sym(x,C) denote the symmetry value of x in C, which essentially measures how symmetric C is about the point x. Denote by sym(C) the largest value of sym(x,C) among all x in C, and let x* denote the most symmetric point in C. These symmetry measures are all invariant under linear transformation, change in inner product, etc., and so are of interest in the study of the geometry of convex sets and arise naturally in the evaluation of the complexity of interior-point methods in particular. Herein we show that when C is given by the intersection of halfspaces, i.e., C={x | Ax <= b}, then x* as well as the symmetry value of C can be computed by using linear programming. Furthermore, given an approximate analytic center of C, there is a strongly polynomial-time algorithm for approximating sym(C) to any given relative tolerance.
Subjects
symmetry
geometry of convex sets
interior-point methods
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