Extreme-point stability tests for discrete-time polynomials

The authors provide an extension to some robust stability results for discrete-time polynomials expressed directly in the coefficient domain by making use of extreme-point results for continuous-time polynomials. Specifically, independent variations can be allowed not only in the upper-half of the coefficients but also on the coefficient prior to the center one in the case where the degree of the polynomials under consideration is odd. The case of dependent coefficients is also extended from previous results