Compact composition operators on spaces of Dirichlet series
De Karl-Mikael Perfekt
Some results on composition operators in the unit disc
De Luis Rodriguez-Piazza
Apparaît dans la collection : Interpolation in Spaces of Analytic Functions / Interpolation dans les espaces de fonctions analytiques
Given a finite positive measure $\mu$ on the unit circle, we consider the distance $e_{n}\left ( \mu \right )$ from $z^{n}$ to the analytic polynomials of degree less than $n$ in $L^{2}\left ( \mu \right )$. We study the asymptotic behavior of $e_{n}\left ( \mu \right )$ for $n\rightarrow \infty$ when the logarithmic integral of the density of $\mu$ diverges for different classes of measures $\mu$.