2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132320This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).This paper has been withdrawnClassical Analysis and ODEsFunctional Analysis26C10; 30C15; 47A55; 47A56Smooth multiparameter perturbation of polynomials and operatorstext