2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59790This paper deals with fractional-order controlled systems and fractional-order controllers in the frequency domain. The mathematical description by fractional transfer functions and properties of these systems are presented. The new ways for modelling of fractional-order systems are illustrated with a numerical example and obtained results are discussed in conclusion.LaTeX v.2.09, 4 pages, 5 (eps) figuresOptimization and Control26A33, 93C80 (Primary), 93C05 (Secondary)text