2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63876We give elementary proof of a stability result concerning an exponential asymptotic ($t\to\infty$) for filtering estimates generated by wrongly initialized Wonham filter. This proof is based on new exponential bound having independent interest.6 pagesProbabilityOptimization and Control93E11; 60J57text