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Eigenvalues of the Klein-Gordon equation. (English) Zbl 0528.35072


MSC:

35P15 Estimates of eigenvalues in context of PDEs
81Q10 Selfadjoint operator theory in quantum theory, including spectral analysis
35Q99 Partial differential equations of mathematical physics and other areas of application
47F05 General theory of partial differential operators
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References:

[1] DOI: 10.1007/BF01258900 · Zbl 0468.35038 · doi:10.1007/BF01258900
[2] Langer, J. Op. heory
[3] DOI: 10.1007/978-3-642-65567-8 · doi:10.1007/978-3-642-65567-8
[4] DOI: 10.1512/iumj.1977.26.26086 · Zbl 0389.47021 · doi:10.1512/iumj.1977.26.26086
[5] Najman, Glasnik Mat 14 pp 289– (1979)
[6] Schechter, Spectra of Partial Differential Operators (1971)
[7] Reed, Methods of Modern Mathematical Physics I–IV · Zbl 0401.47001
[8] Kato, Perturbation Theory for Linear Operators (1966) · Zbl 0148.12601
[9] DOI: 10.1002/mana.19800990105 · Zbl 0469.47028 · doi:10.1002/mana.19800990105
[10] Weidmann, Proc. of Spectral Theory and Differential Equations (1975) · Zbl 0313.47032
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