Geodesic
Kippenhahn curves of some tridiagonal matrices
Filomat, Tome 35 (2021) no. 9, p. 3047

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DOI

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
DOI : 10.2298/FIL2109047B
Classification : 15A60, 47B36
Keywords: Numerical range, Kippenhahn curve, tridiagonal matrix, reciprocal matrix, elliptical 
Natália Bebiano; João Da Providência; Ilya Spitkovsky; Kenya Vazquez. Kippenhahn curves of some tridiagonal matrices. Filomat, Tome 35 (2021) no. 9, p. 3047 . doi: 10.2298/FIL2109047B
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     title = {Kippenhahn curves of some tridiagonal matrices},
     journal = {Filomat},
     pages = {3047 },
     year = {2021},
     volume = {35},
     number = {9},
     doi = {10.2298/FIL2109047B},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/FIL2109047B/}
}
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