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Criteria for Discrete Spectrum of Singular Selfadjoint Differential Operators
L. W. Rollins
Proceedings of the American Mathematical Society
Vol. 34, No. 1 (Jul., 1972), pp. 195-200
Published by: American Mathematical Society
Stable URL: http://www.jstor.org/stable/2037927
Page Count: 6
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Under certain conditions on the coefficients of symmetric singular differential operators of order $2n$, selfadjoint extensions are shown to have a discrete spectrum. The results are proven specifically for the Friedrichs extension.
Proceedings of the American Mathematical Society © 1972 American Mathematical Society