2 papers
math.FA2025
Krein Space Numerical Range of Block Matrices -- a Unified Approach to the Hyperbolic Case
N. Bebiano, R. Lemos, G. Soares
In this paper, we investigate the Krein space numerical range of -by- block matrices, with diagonal blocks as scalar multiples of the identity. For these matrices, we specifi…
math.FA2024
Matrices with Hyperbolical Krein Space Numerical Range
N. Bebiano, R. Lemos, G. Soares
This paper is devoted to matrices with hyperbolical Krein space numerical range. This shape characterizes the 2-by-2 case and persists for certain classes of matrices, independentl…