Details

Autor(en) / Beteiligte

• Tošić, Marina
• Ljajko, Eugen
• Kontrec, Nataša
• Stojanović, Vladica

Titel

The Nullity, Rank, and Invertibility of Linear Combinations of k-Potent Matrices

Ist Teil von

• Mathematics (Basel), 2020-12, Vol.8 (12), p.2147

Ort / Verlag

Basel: MDPI AG

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Baksalary et al. (Linear Algebra Appl., doi:10.1016/j.laa.2004.02.025, 2004) investigated the invertibility of a linear combination of idempotent matrices. This result was improved by Koliha et al. (Linear Algebra Appl., doi:10.1016/j.laa.2006.01.011, 2006) by showing that the rank of a linear combination of two idempotents is constant. In this paper, we consider similar problems for k-potent matrices. We study the rank and the nullity of a linear combination of two commuting k-potent matrices. Furthermore, the problem of the nonsingularity of linear combinations of two or three k-potent matrices is considered under some conditions. In these situations, we derive explicit formulae of their inverses.