p-convex iteration groups
Pólya Operators I: Total Positivity.
Pólya Operators II: Complete Concavity.
Polynomial approximation and twenty years later.
Polynomial selections and separation by polynomials
K. Nikodem and the present author proved in [3] a theorem concerning separation by affine functions. Our purpose is to generalize that result for polynomials. As a consequence we obtain two theorems on separation of an n-convex function from an n-concave function by a polynomial of degree at most n and a stability result of Hyers-Ulam type for polynomials.
Polynomial two-point expansions.
Polynomials and convex sequence inequalities.