16 research outputs found
Elliptical higher rank numerical range of some Toeplitz matrices
No full textThe higher rank numerical range is described for a class of matrices which happen to be unitarily reducible to direct sums of (at most) 2-by-2 blocks. In particular, conditions are established under which tridiagonal matrices have elliptical rank-k numerical ranges. © 2018 Elsevier Inc
Positive Matrix Functions on the Bitorus with Prescribed Fourier Coefficients in a Band.
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Constructive factorization of some almost periodic triangular matrix functions with a quadrinomial off diagonal entry
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