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In this article, we extend the results for Toeplitz matrices obtained by Noschese, Pasquini, and Reichel. We study the distance d, measured in the Frobenius norm, of a real tridiagonal 2‐Toeplitz matrix T to the closure
of the set formed by the real irreducible tridiagonal normal matrices. The matrices in
, whose distance to T is d, are characterized, and the location of their eigenvalues...
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