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eigenvalues of matrices or operators

5 votes
3 answers
269 views

Significance of the length of the Perron eigenvector

Let $A$ be a positive square matrix. Perron-Frobenius theory says that there exist $\lambda,v$ with $Av=\lambda v$ and $\lambda$ equals the spectral radius of $A$, $\lambda$ is simple, and $v$ is posi …
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  • 175
2 votes
0 answers
68 views

Unimodular eigenvalue of a H-self-adjoint matrix (indefinite innerproduct)

In particular, whereas standard unitary matrices have all their eigenvalues on the unit circle, the spectrum of $H$-unitary matrices is merely symmetric with respect to the unit circle, that is, if $A$ … And I have not been able to find results on unimodular eigenvalues of $H$-self-adjoint matrices. Any help is appreciated! [1] Gohberg, Israel, Peter Lancaster, and Leiba Rodman. …
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  • 175