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• W805422548 abstract "Moser & Tardos have developed a powerful algorithmic approach (henceforth MT) to the Lovasz Local Lemma (LLL); the basic operation done in MT and its variants is a search for events in a current configuration. In the initial stage of MT, the variables are set independently. We examine the distributions on these variables which arise during intermediate stages of MT. We show that these configurations have a more or less random form, building further on the concept of Haeupler et al. in understanding the (intermediate and) output distribution of MT. This has a variety of algorithmic applications; the most important is that bad events can be found relatively quickly, improving upon MT across the complexity spectrum: it makes some polynomial-time algorithms sub-linear (e.g., for Latin transversals, which are of basic combinatorial interest), gives lower-degree polynomial run-times in some settings, transforms certain super-polynomial-time algorithms into polynomial-time ones, and leads to Las Vegas algorithms for some coloring problems for which only Monte Carlo algorithms were known. We show that in certain conditions when the LLL condition is violated, a variant of the MT algorithm can still produce a distribution which avoids most of the bad events. We show in some cases this MT variant can run faster than the original MT algorithm itself, and develop the first-known criterion for the case of the asymmetric LLL. This can be used to find partial Latin transversals -- improving upon earlier bounds of Stein (1975) -- among other applications. We furthermore give applications in enumeration, showing that most applications (where we aim for all or most of the bad events to be avoided) have many more solutions than known before by proving that the MT-distribution has large min-entropy and hence that its support-size is large." @default.
• W805422548 created "2016-06-24" @default.
• W805422548 creator A5005118312 @default.
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• W805422548 date "2015-12-21" @default.
• W805422548 modified "2023-09-23" @default.
• W805422548 title "Algorithmic and Enumerative Aspects of the Moser-Tardos Distribution" @default.
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• W805422548 doi "https://doi.org/10.1137/1.9781611974331.ch140" @default.
• W805422548 hasPublicationYear "2015" @default.
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