Singular matrices whose Moore-Penrose inverse is tridiagonal

• Tipo: Artigo em Revista Científica Internacional
• Data: 2023

Autores

Bueno, MI (Autor) Outra; Susana Borges Furtado (Autor) FEP

Revista

Título: Applied Mathematics and Computation

Vol. 459

ISSN: 0096-3003

Editora: Elsevier

Indexação

ISI Web of Knowledge - 2 Citações

Scopus - 3 Citações

Outras Informações

ID Authenticus: P-00Y-R3A

DOI: 10.1016/j.amc.2023.128154

Abstract (EN): A variety of characterizations of nonsingular matrices whose inverse is tridiagonal (irreducible or not) have been widely investigated in the literature. One well-known such characterization is stated in terms of semiseparable matrices. In this paper, we consider singular matrices A and give necessary and sufficient conditions for the Moore-Penrose inverse of A to be tridiagonal. Our approach is based on bordering techniques, as given by Bapat and Zheng (2003). In addition, we obtain necessary conditions on A analogous to the semiseparability conditions in the nonsingular case, though in the singular case they are not sufficient, as illustrated with examples. We apply our results to give an explicit description of all the 3 x 3 real singular matrices and 3 x 3 Hermitian matrices whose Moore-Penrose inverse is irreducible and tridiagonal.& COPY; 2023 Elsevier Inc. All rights reserved.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14