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• W2069892855 abstract "This article is a continuation of the article [F. Zhang, Geršgorin type theorems for quaternionic matrices, Linear Algebra Appl. 424 (2007), pp. 139–153] on the study of the eigenvalues of quaternion matrices. Profound differences in the eigenvalue problems for complex and quaternion matrices are discussed. We show that Brauer's theorem for the inclusion of the eigenvalues of complex matrices cannot be extended to the right eigenvalues of quaternion matrices. We also provide necessary and sufficient conditions for a complex square matrix to have infinitely many left eigenvalues, and analyse the roots of the characteristic polynomials for 2 × 2 matrices. We establish a characterisation for the set of left eigenvalues to intersect or be part of the boundary of the quaternion balls of Geršgorin." @default.
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• W2069892855 date "2011-04-01" @default.
• W2069892855 modified "2023-10-03" @default.
• W2069892855 title "On the eigenvalues of quaternion matrices" @default.
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• W2069892855 doi "https://doi.org/10.1080/03081081003739204" @default.
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