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25 April 2024

» arxiv » 1311.2133

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Extremizers and Bellman function for martingale weak type inequality
Alexander Reznikov ; Vasiliy Vasyunin ; Alexander Volberg ;
Date:	9 Nov 2013
Abstract:	We give an exact formula for the Bellman function of the weak type of martingale transform. We also give the extremal functions (actually extremal sequences of functions). We find them using the precise form of the Bellman function. The extremal examples have a fractal nature as it often happens in that kind of problems. This article is devoted to the unweighted weak type estimate.
Source:	arXiv, 1311.2133
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