2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/128483We give a proof of a so-called "local $Tb$" Theorem for singular integrals whose kernels satisfy the standard Calderón-Zygmund conditions. The present theorem, which extends an earlier result of M. Christ \cite{Ch}, was proved in \cite{AHMTT} for "perfect dyadic" Calderón-Zygmund operators. The proof in \cite{AHMTT} essentially carries over to the case considered here, with some technical adjustments.Unpublished manuscript, based on the cited paper [AHMTT]Classical Analysis and ODEsAnalysis of PDEs42B20text