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Presented to “American Mathematical Society” April 26, 1958.
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Amir-Moéz, A.R. Some equalities in a unitary space leading to equalities concerning singular values of sets of matrices. Math. Ann. 135, 388–390 (1958). https://doi.org/10.1007/BF01342955
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DOI: https://doi.org/10.1007/BF01342955