2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132469This expository paper covers the first two sections of chapter VI of Shelah's book "Proper and Improper Forcing," including the preservationn (using CS iterations of proper forcings) of omega-omega bounding, Sacks property, Lavewr property, P-point property, and others.Logic03E35text