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Canonical forms and principal systems for general disconjugate equations. (English) Zbl 0289.34051

##### MSC:
 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations 34C99 Qualitative theory for ordinary differential equations
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##### References:
 [1] W. A. Coppel, Disconjugacy, Lecture Notes in Mathematics, Vol. 220, Springer-Verlag, Berlin-New York, 1971. · Zbl 0224.34003 [2] Philip Hartman, Disconjugate \?th order differential equations and principal solutions, Bull. Amer. Math. Soc. 74 (1968), 125 – 129. · Zbl 0162.39102 [3] Philip Hartman, Principal solutions of disconjugate \?-\?\? order linear differential equations, Amer. J. Math. 91 (1969), 306 – 362. · Zbl 0184.11603 · doi:10.2307/2373512 · doi.org [4] Philip Hartman, Corrigendum and addendum: ”Principal solutions of disconjugate \?-th order linear differential equations”, Amer. J. Math. 93 (1971), 439 – 451. · Zbl 0222.34027 · doi:10.2307/2373386 · doi.org [5] A. Ju. Levin, The non-oscillation of solutions of the equation \?\?$$^{n}$$\?+\?$$_{1}$$(\?)\?\?$$^{n}$$$$^{-}$$\textonesuperior \?+\cdots+\?_\?(\?)\?=0, Uspehi Mat. Nauk 24 (1969), no. 2 (146), 43 – 96 (Russian). [6] 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. · JFM 50.0299.02 [7] D. Willett, Asymptotic behaviour of disconjugate \?th order differential equations, Canad. J. Math. 23 (1971), 293 – 314. · Zbl 0201.10702 · doi:10.4153/CJM-1971-030-4 · doi.org [8] D. Willett, Disconjugacy tests for singular linear differential equations, SIAM J. Math. Anal. 2 (1971), 536 – 545. · Zbl 0241.34029 · doi:10.1137/0502055 · doi.org
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