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In this paper we study the regularity properties of two maximal operators of convolution type: the heat flow maximal operator (associated to the Gauss kernel) and the Poisson maximal operator (associated to the Poisson kernel). In dimension d=1 we prove that these maximal operators do not increase the Lp-variation of a function for any p⩾1, while in dimensions d>1 we obtain the corresponding results...
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