2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153802An observability problem for linear autonomous distributed systems in the class of linear operations is considered. A criterion of observability with respect to terminal state has been proved. A connection with observability with respect to initial state is discussed.20 pages, LaTeXExactly Solvable and Integrable Systemstext