2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/208908We reprove a result concerning certain ruin in the classical problem of the probability of ruin with risky investments and several of it's generalisations. We also provide the combined transition density of the risk and investment processes in the diffusion case.12 pages; Corrected typos and labelsProbabilityRisk Management62P05; 43A80text