Certain classes of normal Toeplitz-plus-Hankel matrices whose eigenvalues can be computed as efficiently as those of circulants are indicated.
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Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 439, 2015, pp. 5–12.
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Abdikalykov, A.K., Ikramov, K.D. On the Eigenvalues of Certain Classes of Normal (T + H)-Matrices. J Math Sci 216, 725–729 (2016). https://doi.org/10.1007/s10958-016-2935-6
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DOI: https://doi.org/10.1007/s10958-016-2935-6