2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93328A straightforward argument shows that, by allowing counterfactual elements of physical reality, any arbitrary discrete finite-dimensional operator corresponds to an observable.4 pages, also available at http://tph.tuwien.ac.at/~svozil/publ/every.psQuantum Physicstext