2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/162133Within the functional calculi of Bochner-Phillips and Hirsch, we describe the operators of distributed order differentiation and integration as functions of the classical differentiation and integration operators respectively.Version 2: typos are corrected. To appear in Ukrainian Math. JournalMathematical PhysicsFunctional Analysis26A33; 47A60text