2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/126482Starting from an arbitrary endomorphism δof a unital C*-algebra A we construct a crossed product. It is shown that the natural construction depends not only on the C*-dynamical system (A,δ) but also on the choice of an ideal J orthogonal to Ker δ.17 pagesOperator AlgebrasFunctional Analysis47L65, 46L05text