Sums of Weighted Differentiation Composition Operators

Abstract

We solve an interpolation problem in $A_{\alpha }^p$ involving specifying a set of (possibly not distinct) $n$ points, where the $k^{\text{th}}$ derivative at the $k^{\text{th}}$ point is up to a constant as large as possible for functions of unit norm. The solution obtained has norm bounded by a constant independent of the points chosen. As a direct application, we obtain a characterization of the order-boundedness of a sum of products of weighted composition and differentiation operators acting between weighted Bergman spaces. We also characterize the compactness of such operators that map a weighted Bergman space into the space of bounded analytic functions.

13 pages