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Discrete spectrum of perturbed Dirac systems with real and periodic coefficients
1990
Proceedings of the Royal Society of Edinburgh. Section A Mathematics
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SynopsisThis paper deals with the number of eigenvalues which appear in the gaps of the spectrum of a Dirac system with real and periodic coefficients when the coefficients are perturbed. The main results provide an upper bound and a condition under which exactly one eigenvalue appears in a given gap.
doi:10.1017/s0308210500020680
fatcat:tam7g7elzjgz3ltyu7jven4jsa