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Published online by Cambridge University Press: 24 July 2023
Suppose $2< p<\infty$ and $\varphi$
is a holomorphic self-map of the open unit disk $\mathbb {D}$
. We show the following assertions:
(1) If $\varphi$ has bounded valence and0.1
is in the Schatten $p$
-class of the Hardy space $H^2$
.
(2) There exists a holomorphic self-map $\varphi$ (which is, of course, not of bounded valence) such that the inequality (0.1) holds and $C_{\varphi }: H^2\to H^2$
does not belong to the Schatten $p$
-class.