Logarithmic Bloch space and its predual

Details Logarithmic Bloch space and its predual Logarithmic Bloch space and its predual

2011-04-24

arxiv.org/abs/1104.4629v1

Mathematics

Complex Variables

Scientific paper

We consider the space $\bk^1_{\log^\alpha}$, of analytic functions on the unit disk $\D,$ defined by the requirement $\int_\D|f'(z)|\phi(|z|)\,dA(z)<\infty,$ where $\phi(r)=\log^\alpha(1/(1-r))$ and show that it is a predual of the "$\log^\alpha$-Bloch" space and the dual of the corresponding little Bloch space. We prove that a function $f(z)=\sum_{n=0}^\infty a_nz^n$ with $a_n\downarrow 0$ is in $\bk^1_{\log^\alpha}$ iff $\sum_{n=0}^\infty \log^\alpha(n+2)/(n+1)<\infty$ and apply this to obtain a criterion for membership of the Libera transform of a function with positive coefficients in $\bk^1_{\log^\alpha}.$ Some properties of the Ces\'aro and the Libera operator are considered as well.

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