Martingale transforms and the Hardy-Littlewood-Sobolev inequality for semigroups
Abstract
We give a representation of the fractional integral for symmetric Markovian semigroups as the projection of martingale transforms and prove the Hardy-Littlewood-Sobolev(HLS) inequality based on this representation. The proof rests on a new inequality for a fractional Littlewood-Paley g-function.
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