CONTENTSIntroduction § 1. Theorems on the convex hulls of the rearrangements of a vector (finite-dimensional case) § 2. The eigen- and singular values of the sum and product of matrices § 3. Two theorems on symmetric gauge functions § 4. Theorems on the convex hulls of the rearrangements of a vector (infinite-dimensional case) § 5. The eigen- and singular values of the sum and product of completely continuous operatorsReferences
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A. S. Markus (1964) studied this question.
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