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Mathematical proof demonstrates Riesz bases in Hilbert space using Dirac operators' eigenvalues.
We prove, that if \λₙ∈ Z is the set of eigenvalues of selfadjoint Dirac operator on (0,π) , then the system \(matrixsinλₙx\\ -cosλₙxmatrix)∈ Z is a Riesz bases in Hilbert space L²([0,π]),C²) .
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T. N. Harutyunyan (2026) studied this question.
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