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math.FA2025
Weighted composition operators on Hilbert function spaces on the ball
Michael Hartz, Maximilian Tornes
A weighted composition operator on a reproducing kernel Hilbert space is given by a composition, followed by a multiplication. We study unitary and co-isometric weighted compositio…
math.FA2024
On von Neumann's inequality on the polydisc
Michael Hartz
Given a -tuple of commuting contractions on Hilbert space and a polynomial in -variables, we seek upper bounds for the norm of the operator . Results of von Neu…