17 citations · 17 across the 1 of their papers we have counts for
2 papers
math.FA2017
On universal operators and universal pairs
Riikka Schroderus, Hans-Olav Tylli
We study some basic properties of the class of universal operators on Hilbert space, and provide new examples of universal operators and universal pairs.
math.FA2016★ 17 cited
Spectra of linear fractional composition operators on the Hardy and weighted Bergman spaces of the half-plane
Riikka Schroderus
We compute the spectra and the essential spectra of bounded linear fractional composition operators acting on the Hardy and weighted Bergman spaces of the upper half-plane. We are…