2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63068We prove a weak-type estimate for a class of operators extending some of the almost orthogonality issues involved in the study of the bilinear Hilbert transform by Lacey and Thiele.6 pagesClassical Analysis and ODEs42BA weak-type orthogonality principletext