Decomposition of a Hermitian matrix into a sum of a fixed number of orthoprojections von V. I. Rabanovych

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On Decompositions of a Scalar Operator into a Sum of Self-Adjoint Operators with Finite Spectrum von V. I. Rabanovych

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On connection between the norm of a sum of orthoprojections onto subspaces and the norm of the product of orthoprojections onto the corresponding orthogonal complements von V. I. Rabanovych

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