Geodesic
The q-numerical range of 3X3 tridiagonal matrices
The electronic journal of linear algebra, Tome 20 (2010), pp. 376-390.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: For $0 \leq q \leq 1$, we examine the q-numerical ranges of $3 \times 3$ tridiagonal matrices $A(b)$ that interpolate between the circular range W $0 (A(b))$ and the elliptical range W
Classification : 15A60
Keywords: tridiagonal matrix, Davis-wielandt shell, q-numerical range 
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     title = {The q-numerical range of {3X3} tridiagonal matrices},
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Chien, Mao-Ting; Nakazato, Hiroshi. The q-numerical range of 3X3 tridiagonal matrices. The electronic journal of linear algebra, Tome 20 (2010), pp. 376-390. http://geodesic.mathdoc.fr/item/ELA_2010__20__a25/