Two Weight Inequalities for Iterated Commutators with Calderón-Zygmund Operators

Abstract

Given a Calderón-Zygmund operator $T$, a classic result of Coifman-Rochberg-Weiss relates the norm of the commutator $[b,T]$ with the BMO norm of $b$. We focus on a weighted version of this result, obtained by Bloom and later generalized by Lacey and the authors, which relates $\Vert [b,T]:L^p({\mathbb{R}}^n;\mu )\to L^p({\mathbb{R}}^n;\lambda )\Vert$ to the norm of $b$ in a certain weighted BMO space determined by $A_p$ weights $\mu$ and $\lambda$. We extend this result to higher iterates of the commutator and recover a one-weight result of Chung-Pereyra-Perez in the process.