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• W2973592222 abstract "We consider Coifman--Fefferman inequalities for rough homogeneous singular integrals $T_Omega$ and $C_p$ weights. It was recently shown by Li-P'erez-Rivera-R'ios-Roncal that $$ |T_Omega |_{L^p(w)} le C_{p,T,w} |Mf|_{L^p(w)} $$ for every $0 max{1,p}$ without using extrapolation theory. Although the bounds we prove are new even in a qualitative sense, we also give the quantitative bound with respect to the $C_q$ characteristic. Our techniques rely on recent advances in sparse domination theory and we actually prove most of our estimates for sparse forms. Our second goal is to continue the structural analysis of $C_p$ classes. We consider some weak self-improving properties of $C_p$ weights and weak and dyadic $C_p$ classes. We also revisit and generalize a counterexample by Kahanpaa and Mejlbro who showed that $C_p setminus bigcup_{q > p} C_q neq emptyset$. We combine their construction with techniques of Lerner to define an explicit weight class $widetilde{C}_p$ such that $bigcup_{q > p} C_q subsetneq widetilde{C}_p subsetneq C_p$ and every $w in widetilde{C}_p$ satisfies Muckenhoupt's conjecture. In particular, we give a different, self-contained proof for the fact that the $C_{p+varepsilon}$ condition is not necessary for the Coifman--Fefferman inequality and our ideas allow us to consider also dimensions higher than $1$." @default.
• W2973592222 created "2019-09-26" @default.
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• W2973592222 date "2019-09-18" @default.
• W2973592222 modified "2023-09-27" @default.
• W2973592222 title "$C_p$ estimates for rough homogeneous singular integrals and sparse forms" @default.
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