Weak compactness and essential norms of integration operators

Details Weak compactness and essential norms of integration operators Weak compactness and essential norms of integration operators

2011-01-22

arxiv.org/abs/1101.4329v1

Mathematics

Functional Analysis

Scientific paper

Let $g$ be an analytic function on the unit disc and consider the integration operator of the form $T_g f(z) = \int_0^z fg'\,d\zeta$. We show that on the spaces $H^1$ and $BMOA$ the operator $T_g$ is weakly compact if and only if it is compact. In the case of $BMOA$ this answers a question of Siskakis and Zhao. More generally, we estimate the essential and weak essential norms of $T_g$ on $H^p$ and $BMOA$.

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