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- W2994697260 abstract "In the Convex Body Chasing problem, we are given an initial point $$v_0 in mathbb {R}^d$$ and an online sequence of n convex bodies $$F_1, ldots , F_n$$. When we receive $$F_t$$, we are required to move inside $$F_t$$. Our goal is to minimize the total distance traveled. This fundamental online problem was first studied by Friedman and Linial (DCG 1993). They proved an $$varOmega (sqrt{d})$$ lower bound on the competitive ratio, and conjectured that a competitive ratio depending only on d is possible. However, despite much interest in the problem, the conjecture remains wide open. We consider the setting in which the convex bodies are nested: $$F_1 supset cdots supset F_n$$. The nested setting is closely related to extending the online LP framework of Buchbinder and Naor (ESA 2005) to arbitrary linear constraints. Moreover, this setting retains much of the difficulty of the general setting and captures an essential obstacle in resolving Friedman and Linial’s conjecture. In this work, we give a f(d)-competitive algorithm for chasing nested convex bodies in $$mathbb {R}^d$$." @default.
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- W2994697260 date "2019-12-20" @default.
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- W2994697260 title "Nested Convex Bodies are Chaseable" @default.
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- W2994697260 doi "https://doi.org/10.1007/s00453-019-00661-x" @default.
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