2 papers
math.CO2023
Numerical ranges of cyclic shift matrices
Mao-Ting Chien, Steve Kirkland, Chi-Kwong Li +1
We study the numerical range of an cyclic shift matrix, which can be viewed as the adjacency matrix of a directed cycle with weighted arcs. In particular, we consid…
math.FA2018
Norm-parallelism and the Davis--Wielandt radius of Hilbert space operators
A. Zamani, M. S. Moslehian, M. T. Chien +1
We present a necessary and sufficient condition for the norm-parallelism of bounded linear operators on a Hilbert space. We also give a characterization of the Birkhoff--James orth…