Geodesic
A note on classes of structured matrices with elliptical type numerical range
Czechoslovak Mathematical Journal, Tome 71 (2021) no. 4, pp. 1015-1023

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We identify new classes of structured matrices whose numerical range is of the elliptical type, that is, an elliptical disk or the convex hull of elliptical disks.
DOI : 10.21136/CMJ.2021.0174-20
Classification : 15A21, 15A60
Keywords: tridiagonal matrix; antitridiagonal matrix; elliptical disk; numerical range 
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Bebiano, Natália; Furtado, Susana. A note on classes of structured matrices with elliptical type numerical range. Czechoslovak Mathematical Journal, Tome 71 (2021) no. 4, pp. 1015-1023. doi: 10.21136/CMJ.2021.0174-20

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