Hostname: page-component-77c89778f8-vsgnj Total loading time: 0 Render date: 2024-07-23T17:28:47.846Z Has data issue: false hasContentIssue false

On a Class of Singular Differential Operators

Published online by Cambridge University Press:  20 November 2018

R. R. D. Kemp*
Affiliation:
Queen's University
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

In the considerable literature on linear operators in L2 or Lp arising from ordinary differential operators it has always been assumed that the coefficient of the highest order derivative appearing does not vanish in the interior of the interval under consideration. If this coefficient vanishes at one or both endpoints of the interval, or if one or both of the endpoints is infinite the differential operator is said to be singular. In this paper we shall allow this leading coefficient to vanish in the interior of the interval, and show that the theory of such operators can sometimes be reduced to a consideration of several operators of the well-known type. We shall also indicate how those which cannot be so reduced should be dealt with.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 1961

References

1. Bade, W. G. and Schwartz, J. F., On Mautner's eigenfunction expansions, Proc. Nat. Acad. Sci. U.S.A., 42 (1956), 519525.Google Scholar
2. Coddington, E. A., The spectral matrix and Green's function for singular self-adjoint boundary value problems, Can. J. Math., 6 (1954), 169185.Google Scholar
3. Coddington, E. A., On self-adjoint ordinary differential operators, Math. Scand., 4 (1958), 921.Google Scholar
4. Coddington, E. A., On maximal symmetric ordinary differential operators, Math. Scand., 4 (1956), 2228.Google Scholar
5. Coddington, E. A., Generalized resolutions of the identity for closed symmetric ordinary differential operators, Proc. Nat. Acad. Sci. U.S.A., 42 (1956), 638642.Google Scholar
6. Mautner, F. I., On eigenfunction expansions, Proc. Nat. Acad. Sci. U.S.A., 39 (1953), 4953.Google Scholar
7. Nelson, Edward, Kernel functions and eigenfunction expansions, Duke Math. J., 25 (1958), 1528.Google Scholar
8. Rota, G. C., Extension theory of differential operators I, Coram. Pure and Applied Math., 11 (1958), 2365.Google Scholar
9. Rota, G. C., On the spectra of singular boundary value problems, M.I.T. Note (1959).Google Scholar