Resolvent estimates for a function of a linear operator

Abstract

Let $T$ be a bounded linear operator on a Banach space and $f$ an analytic function, defined on the spectrum of $T$. We study the relations between the rate of growth of the resolvent of $T$ and that of $f(T)$. We also discuss whether the property of unconditional basisness of eigenspaces or root spaces of $f(T)$ implies the corresponding property for $T$, and related issues.

The last section has been added. 18 pages