Weighted square function estimates
arXiv:1711.08754
Abstract
The paper contains the proof of -weighted norm inequalities for both, martingales square functions and the classical square functions in harmonic analysis of Littlewood-Paley and Lusin. Furthermore, the bounds are completely explicit and are optimal not only on the dependence of the characteristics of the weight but also on the dependance on , as . The proof rests on Bellman function method: the estimates are deduced from the existence of an appropriate and rather complicated function of four variables.