2 papers
math.FA2024
Wiener-Hopf indices of unimodular functions on the imaginary axis
A. E. Frazho, A. C. M. Ran, F. van Schagen
This paper is concerned with the Wiener-Hopf indices of unimodular rational matrix functions on the imaginary axis. These indices play a role in the Fredholm theory for Wiener-Hopf…
math.FA2023
Wiener-Hopf indices of unimodular functions on the unit circle, revisited
A. E. Frazho, M. A. Kaashoek, A. C. M. Ran +1
Inspired by the paper of Groenewald, Kaashoek and Ran (Wiener-Hopf indices of unitary functions on the unit circle in terms of realizations and related results on Toeplitz operator…