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- W4295128493 abstract "This article considers the question of how to succinctly approximate a multidimensional convex body by a polytope. Given a convex body K of unit diameter in Euclidean d -dimensional space (where d is a constant) and an error parameter ε > 0, the objective is to determine a convex polytope of low combinatorial complexity whose Hausdorff distance from K is at most ε. By combinatorial complexity , we mean the total number of faces of all dimensions. Classical constructions by Dudley and Bronshteyn/Ivanov show that O (1/ε ( d -1)/2 ) facets or vertices are possible, respectively, but neither achieves both bounds simultaneously. In this article, we show that it is possible to construct a polytope with O (1/ε ( d -1)/2 ) combinatorial complexity, which is optimal in the worst case. Our result is based on a new relationship between ε-width caps of a convex body and its polar body. Using this relationship, we are able to obtain a volume-sensitive bound on the number of approximating caps that are “essentially different.” We achieve our main result by combining this with a variant of the witness-collector method and a novel variable-thickness layered construction of the economical cap covering." @default.
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- W4295128493 date "2022-10-31" @default.
- W4295128493 modified "2023-10-17" @default.
- W4295128493 title "Optimal Bound on the Combinatorial Complexity of Approximating Polytopes" @default.
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- W4295128493 doi "https://doi.org/10.1145/3559106" @default.
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