A Kharitonov region is a concept in mathematics. It arises in the study of the stability of polynomials.
Let be a simply-connected set in the complex plane and let be the polynomial family.
is said to be a Kharitonov region if
is a subset of Here, denotes the set of all vertex polynomials of complex interval polynomials and denotes the set of all vertex polynomials of real interval polynomials