2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63411This paper gives a necessary and sufficient condition for robust D-stability of Polytopic Polynomial Matrices. Edge theorem is extended to multi-input-multi-output case.Multivariable version of Edge TheoremOptimization and ControlRings and Algebras93C41; 93D09text