Geodesic
A new inclusion interval for the real eigenvalues of real matrices
Czechoslovak Mathematical Journal, Tome 73 (2023) no. 3, pp. 979-992

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By properties of Cvetković-Kostić-Varga-type (or, for short, CKV-type) \hbox {B-matrices}, a new class of nonsingular matrices called CKV-type $\overline {\text {B}}$-matrices is given, and a new inclusion interval of the real eigenvalues of real matrices is presented. It is shown that the new inclusion interval is sharper than those provided by J. M. Peña (2003), and by H. B. Li et al. (2007). We also propose a direct algorithm for computing the new inclusion interval. Numerical examples are included to illustrate the effectiveness of the obtained results.
DOI : 10.21136/CMJ.2023.0420-22
Classification : 15A18, 15B48, 65F15
Keywords: CKV-type B-matrix; P-matrix; real eigenvalues localization 
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Wang, Yinghua; Song, Xinnian; Gao, Lei. A new inclusion interval for the real eigenvalues of real matrices. Czechoslovak Mathematical Journal, Tome 73 (2023) no. 3, pp. 979-992. doi: 10.21136/CMJ.2023.0420-22

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