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• #### Approximation numbers of composition operators on H^p spaces of Dirichlet series ﻿

(Journal article; Peer reviewed, 2016)
By a theorem of the first named author, $\varphi$ generates a bounded composition operator on the Hardy space ${\mathscr{H}}^p$of Dirichlet series $(1\le p<\infty )$ only if $\varphi (s)=c_0 s+\psi (s)$, where $c_0$ is a ...
• #### Decay rates for approximation numbers of composition operators ﻿

(Journal article; Peer reviewed, 2015)
A general method for estimating the approximation numbers of composition operators on the Hardy space H 2, using finite-dimensional model subspaces, is studied and applied in the case when the symbol of the operator maps ...