The classes of univalent functions connected with homographies
We define some new classes of univalent functions. The Schiffer differential equations are obtained for extremal functions from some of these classes.
We define some new classes of univalent functions. The Schiffer differential equations are obtained for extremal functions from some of these classes.
Let be the cone of real univariate polynomials of degree ≤ 2n which are nonnegative on the real axis and have nonnegative coefficients. We describe the extremal rays of this convex cone and the class of linear operators, acting diagonally in the standard monomial basis, preserving this cone.
We say that an entire function has Fejér gaps if The main result of this paper is as follows: An entire function with Fejér gaps has no finite deficient value.