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Saad R. El-Shabrawy, Compactness Criteria and Spectra of Some Infinite Lower Triangular Matrices, Filomat, Vol. 36, No. 17 (2022), pp. 5913-5933 ...
Two results are proved which concern Riesz points of upper triangular operator matrices. Applications are made to questions involving when Weyl's Theorem holds for an upper triangular operator matrix.
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