Comparison of Stability Analysis Method for Delta-Operator Diamond Polynomials

Abstract

Stability of delta-operator diamond polynomials is known to be equivalent to that of some segment polynomials contained in the family. However, extreme point results do not hold for them.We already proposed two stability analysis methods for delta-operator diamond polynomials: one uses stability analysis method for delta-operator segment polynomials, and the other uses directional stability radii. In this paper, comparison is made to examine which method is more efficient.