Discrete spectra criteria for singular differential operators with middle terms. (English) Zbl 0298.34018


34L99 Ordinary differential operators
34B20 Weyl theory and its generalizations for ordinary differential equations
47E05 General theory of ordinary differential operators
Full Text: DOI


[1] DOI: 10.2307/2037927 · Zbl 0248.34023
[2] Naimark, Linear differential operators (1968)
[3] Eastham, Proc. Cambridge Philos. Soc. 67 pp 277– (1970)
[4] Glazman, Direct methods of qualitative spectral analysis of singular differential operators (1965) · Zbl 0143.36505
[5] DOI: 10.2307/2039528 · Zbl 0254.34027
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