2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100839We investigate the mixing coefficients of interval maps satisfying Rychlik's conditions. A mixing Lasota-Yorke map is reverse $ϕ$-mixing. If its invariant density is uniformly bounded away from 0, it is $ϕ$-mixing iff all images of all orders are big in which case it is $ψ$-mixing. Among $\b$-transformations, non-$ϕ$-mixing is generic. In this sense, the asymmetry of $ϕ$-mixing is natural.correction of misprint in the definition of weak mixingDynamical SystemsProbability37A25, 37E05 (37D20, 37C30, 37C40, 60G10)text