2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/224279We consider the formal prolate spheroid differential operator on a finite symmetric interval and describe all its self-adjoint boundary conditions. Only one of these boundary conditions corresponds to a self-operator differential operator which commutes with the Fourier operator truncated on the considered finite symmetric interval.34 pagesClassical Analysis and ODEsSpectral Theory47E05, 34E05, 33E10text