Matrices with Hyperbolical Krein Space Numerical Range

Published 3 Jul 2024 in math.FA | (2407.03164v2)

Abstract: 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, independently of their size. Ne-cessary and sufficient conditions for low dimensional tridiagonal matrices to have this shape are obtained only involving the matrix entries

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