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A discreteness criterion for the spectrum of a quasielliptic operator. (English) Zbl 0226.35048


MSC:

35P05 General topics in linear spectral theory for PDEs
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References:

[1] A. M. Molchanov, ?Discreteness conditions for the spectrum of self-adjoint second-order differential equations,? Trudy Mosk. Matem. Ob-va,2, 169-200 (1953).
[2] M. Sh. Birman and B. S. Pavlov, ?The complete continuity of certain imbedding operators,? Vestnik Leningr. Un-ta, Ser. Matem. i Mekh., No. 1, 61-74 (1961). · Zbl 0134.11302
[3] R. S. Ismagilov, ?Conditions for the self-adjointness of high-order differential operators,? Dokl. Akad. Nauk SSSR,142, 1239-1242 (1962). · Zbl 0119.07203
[4] I. M. Glazman, Direct Methods for the Qualitative Spectral Analysis of Singular Differential Operators [in Russian], Moscow (1963). · Zbl 0143.36504
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