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math.SP2023
Spectrum and Fine Spectrum of Band Matrices Generated by Oscillatory Sequences
Jyoti Rani, Arnab Patra, P D Srivastava
In this paper, a new class of band matrices is considered where the entries of each non-zero band form a sequence with two limit points. The compact perturbation technique is used…
math.SP2016
On the boundary of the numerical range of some Jacobi operators
R. Birbonshi, A. Patra, P. D. Srivastava
In this paper, we study the numerical range of Jacobi operators and it is shown that under certain conditions, the boundary of the numerical range of these operators can be non-rou…
math.SP2016
On some study of the Fine Spectra of -th band triangular matrices
R. Birbonshi, P. D. Srivastava
It has been observed that for the 2nd and 3rd band lower triangular matrices and , only the boundary of the spectrum gives the continuous spectrum while the rest…