2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161845We discuss controllability of systems that are initially given by boundary coupled p.d.e. of second order. Those systems may be described by modules over a certain subring R of the ring of Mikusinski operators with compact support. We show that the ring R is a Bezout domain. This property is utilized in order to derive algebraic and trajectory related controllability results.16 pages; sections 1 and 3.2 revised; corrected typosOptimization and Control93B05, 93B25, 93C20text