2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58104This is the extended version of a talk presented at the J.W.Goethe Universitaet Frankfurt a. M. and at the same time a preview at a forthcoming extensive publication on the same subject. It is shown that there is a common background structure for quantum and classical observables. Moreover, a contextual generalization of the notion of quantum observable is proposed.Mathematical PhysicsOperator AlgebrasQuantum Physicstext