2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63412For the left-sector stability of interval polynomials, it suffices to check a subset of its vertex polynomials. This paper provides a recipe for construction of these critical vertices. Illustrative examples are presented.new constructive methodOptimization and ControlDynamical Systems93D09; 93B25text