Abstract
(k, n − k)-disfocality of equation (1.1) is characterized very conveniently by a set of n inequalities, as described in Theorem 6.3 and its consequences. This characterization serves as a basis to a large number of necessary conditions and sufficient conditions for (k, n − k)-disfocality. For (k, n − k)-disconjugacy the situation is quite different. Our study is less systematic and each result is proved by some ad hoc method.
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© 1997 Springer Science+Business Media Dordrecht
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Elias, U. (1997). Disconjugacy and its Characterization. In: Oscillation Theory of Two-Term Differential Equations. Mathematics and Its Applications, vol 396. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2517-0_10
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DOI: https://doi.org/10.1007/978-94-017-2517-0_10
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-4806-6
Online ISBN: 978-94-017-2517-0
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