A necessary and sufficient condition for disfocality
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- by James S. Muldowney PDF
- Proc. Amer. Math. Soc. 74 (1979), 49-55 Request permission
Abstract:
A criterion for the disfocality of a linear differential operator is given. The condition is analogous to a disconjugacy criterion of Pólya (1922).References
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F. R. Gantmacher, The theory of matrices, Vol. I, Chelsea, New York, 1960.
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- G. Pólya, On the mean-value theorem corresponding to a given linear homogeneous differential equation, Trans. Amer. Math. Soc. 24 (1922), no. 4, 312–324. MR 1501228, DOI 10.1090/S0002-9947-1922-1501228-5
Additional Information
- © Copyright 1979 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 74 (1979), 49-55
- MSC: Primary 34C10
- DOI: https://doi.org/10.1090/S0002-9939-1979-0521872-5
- MathSciNet review: 521872