MATHEMATICA SLOVACA, cilt.72, sa.3, ss.719-736, 2022 (SCI-Expanded)
The goal of this paper is to obtain the spectra and fine spectra of the matrix Delta(ab)(3) on the Hahn space. Also, we explore some ideas of how to study the problem for a general form of the matrix, namely, the matrix Delta(ab)(3) where the non-zero diagonals are the entries of a n-ary repetition sequence. (C) 2022 Mathematical Institute Slovak Academy of Sciences