2 papers
math.FA2023
The numerical range of periodic banded Toeplitz operators
Benjamín A. Itzá-Ortiz, Rubén A. Martínez-Avendaño, Hiroshi Nakazato
We prove that the closure of the numerical range of a -periodic and -banded Toeplitz operator can be expressed as the closure of the convex hull of the uncountable u…
math.RA2022
Matrices similar to centrosymmetric matrices
Benjamín A. Itzá-Ortiz, Rubén A. Martínez-Avendaño
In this paper we give conditions on a matrix which guarantee that it is similar to a centrosymmetric matrix. We use this conditions to show that some and …