Open AccessKippenhahn curves of some tridiagonal matrices
Author(s) -
Natália Bebiano,
Providência da,
Ilya M. Spitkovsky,
Kenya Vazquez
Publication year - 2021
Publication title -
filomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.449
H-Index - 34
eISSN - 2406-0933
pISSN - 0354-5180
DOI - 10.2298/fil2109047b
Subject(s) - tridiagonal matrix , mathematics , diagonal , reciprocal , tridiagonal matrix algorithm , constant (computer programming) , diagonal matrix , band matrix , main diagonal , combinatorics , pure mathematics , mathematical analysis , geometry , square matrix , symmetric matrix , eigenvalues and eigenvectors , physics , quantum mechanics , linguistics , philosophy , computer science , programming language
Tridiagonal matrices with constant main diagonal and reciprocal pairs of off-diagonal entries are considered. Conditions for such matrices with sizes up to 6-by-6 to have elliptical numerical ranges are obtained.