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Publication:3895829
zbMath0449.34013MaRDI QIDQ3895829
Publication date: 1977
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Special ordinary differential equations (Mathieu, Hill, Bessel, etc.) (34B30) Ordinary differential operators (34L99)
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Eigenvalue asymptotics of perturbed periodic Dirac systems in the slow-decay limit ⋮ Virtual bound levels in a gap of the essential spectrum of the weakly perturbed periodic Schrödinger operator ⋮ Effective Prüfer angles and relative oscillation criteria ⋮ Relative oscillation theory for Dirac operators ⋮ Relative oscillation theory, weighted zeros of the Wronskian, and the spectral shift function ⋮ Generalized Prüfer variables for perturbations of Jacobi and CMV matrices ⋮ Eigenvalues in gaps of perturbed periodic Dirac operators: Numerical evidence
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