Geodesic
On the ratio $f(t + cf^{-\alpha }\,(t))/f(t)$.
Bollettino della Unione matematica italiana, Série 3, Tome 14 (1959) no. 1, pp. 57-61.

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Hartman, Philip. On the ratio $f(t + cf^{-\alpha }\,(t))/f(t)$.. Bollettino della Unione matematica italiana, Série 3, Tome 14 (1959) no. 1, pp. 57-61. http://geodesic.mathdoc.fr/item/BUMI_1959_3_14_1_a6/

[1] M. Biernacki , Sur l'équation différentielle x"+A(t)x = 0, «Prace Matematyczno Fizyczne», vol. 40 (1933), pp. 163-171. | Zbl

[2] P. Hartman , Unrestricted solution fields of almost separable differential equations, «Transactions of the American Mathematical Society». vol. 63 (1948), pp. 560-580. | MR | Zbl

[3] P. Hartman , The number of L2-solutions of x'' + q(t)x = 0, «American Journal of Mathematics», vol. 73 (1951), pp. 635-645. | MR | Zbl

[4] P. Hartman , On the eigenvalues of differential equations, ibid., pp. 657-662. | MR | Zbl

[5] P. Hartman and A. Wintner , The asymptotic arcus variation of solutions of real linear, differential equations of second order, ibid., vol. 70 (1948), pp. 1-10. | Zbl

[6] P. Hartman and A. Wintner , On the asymptotic problems of the zeros in wave mechanics, ibid., pp. 461-480. | Zbl

[7] G. Sansone , Equazioni differenziali nel campo reale, vol. 2, Bologna (1949). | Jbk 67.0306.01 | Zbl

[8] A. Wiman , Ueber die reellen Lösungen der linearen Differentialgleichungen zweiter Ordnung, «Arkiv för Matematik. Astronomi und Fysik», vol. 12 (1917), No. 14. | Jbk 46.0666.04