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Hill’s operator with finitely many gaps. (English. Russian original) Zbl 0318.34038

Funct. Anal. Appl. 9, 65-66 (1975); translation from Funkts. Anal. Prilozh. 9, No. 1, 69-70 (1975).

MSC:

34B30 Special ordinary differential equations (Mathieu, Hill, Bessel, etc.)
34L99 Ordinary differential operators
47A25 Spectral sets of linear operators
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References:

[1] S. P. Novikov, Funktsional. Analiz. i Ego Prilozhen.,8, No. 3, 54-66 (1974). · Zbl 0301.54027 · doi:10.1007/BF02028308
[2] E. C. Titchmarsh, Eigenfunction Expansions Associated with Second-Order Differential Equations, Oxford Univ. Press. · Zbl 0097.27601
[3] N. I. Akhiézer, Dokl. Akad. Nauk SSSR,141, No. 2, 263-266 (1961).
[4] É. I. Zverovich, Uspekhi Mat. Nauk,26, No. 1 113-180 (1971).
[5] A. R. Its and V. B. Matveev, Teor. i Matem. Fiz.,23, No. 1 (1975).
[6] H. Hochstadt, Arch. Rat. Mech. Anal.,19, 353-362 (1965). · Zbl 0128.31201 · doi:10.1007/BF00253484
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