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math.FA2021
On Kippenhahn curves and higher-rank numerical ranges of some matrices
Natália Bebiano, Joáo da Providéncia, Ilya M. Spitkovsky
The higher rank numerical ranges of generic matrices are described in terms of the components of their Kippenhahn curves. Cases of tridiagonal (in particular, reciprocal) 2-periodi…
math.FA2020
Kippenhahn curves of some tridiagonal matrices
Natália Bebiano, Joáo da Providéncia, Ilya M. Spitkovsky +1
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 elliptica…