On solutions of linear differential equations of arbitrary fast growth in the unit disc

Author
N. S. Semochko
Ivan Franko National University of Lviv
Abstract
We investigate fast growing solutions of linear differential equations in the unit disc. For that we introduce a general scale to measure the growth of functions of infinite order including arbitrary fast growth. We describe the growth relations between entire coefficients and solutions of the linear differential equation $f^{(n)}+a_{n-1}(z)f^{(n-1)}+\ldots +a_{0}(z)f=0$ in this scale and we investigate the growth of solutions where the coefficient of $f$ dominates the other coefficients near a point on the boundary of the unit disc.
Keywords
linear differential equation; growth of solutions; Nevanlinna characteristic; iterated order; meromorphic function
DOI
doi:10.15330/ms.45.1.3-11
Reference
1. B. Belaidi, Growth of solutions to linear equations with analytic coefficients of [p, q]-order in the unit disc, Electron. J. Diff. Equ., 156 (2011), 1-11.

2. T.B. Cao, H.Y. Yi, The growth of solutions of linear differential equations with coefficients of iterated order in the unit disc, J. Math. Anal. Appl., 319 (2006), ¹1, 278-294.

3. I. Chyzhykov, G.G. Gundersen, J. Heittokangas, Linear differential equations and logarithmic derivative estimates, Proc. London Math. Soc., 86 (2003), ¹3, 735-754.

4. I. Chyzhykov, J. Heittokangas, J. Rattya, On the finiteness of $\varphi$-order of solutions of linear differential equations in the unit disc, J. Math. Anal. Appl., 109 (2009), ¹1, 163-198.

5. I. Chyzhykov, J. Heittokangas, J. Rattya, Sharp logarithmic derivative estimates with applications to ODEfs in the unit disc, J. Austr. Math. Soc., 88 (2010), 145-167.

6. I. Chyzhykov, N. Semochko, Fast growing entire solutions of linear differential equations, submitted.

7. A.A. Goldberg, I.V. Ostrovskii, Value distribution of meromorphic functions, American Mathematical Society, 2008.

8. S. Hamouda, Iterated order of solutions of linear differential equations in the unit disk, Comput. Methods Funct. Theory, 13 (2013), 545-555.

9. J. Heittokangas, On complex differential equations in the unit disc, Ann. Acad. Sci. Fenn. Math. Diss, 122 (2000), 1-54.

10. J. Heittokangas, R. Korhonen, J. Rattya, Fast growing solutions of linear differential equations in the unit disc, Result. Math., 49 (2006), 265-278.

11. J. Heittokangas, R. Korhonen, J. Rattya, Growth estimates for solutions of linear complex differential equations, Ann. Acad. Sci. Fenn. Math., 29 (2004), ¹1, 233-246.

12. J.-M. Huusko, Localization of linear differential equations in the unit disc by a confornal map, Bull. Aust. Math. Soc., 93 (2016), 260-271.

13. R. Korhonen, J. Rattya, Finite order solutions of linear differential equations in the unit disc, J. Math. Anal. Appl., 349 (2009), 43-54.

14. I. Laine, Nevanlinna theory and complex differential equations, Walter de Gruyter, Berlin, 1993.

15. Z. Latreuch, B. Bela.di, Linear differential equations with analytic coefficients of [p, q]-order in the unit disc, Sarajevo J. Math., 9 (2013), ¹21, 71-84.

16. C.N. Linden, On a conjecture of Valiron concerning sets of indirect Borel points, J. London Math. Soc., 41 (1966), 304-312.

17. J. Liu, J. Tu, L.Z. Shi, Linear differential equations with coefficients of (p, q)-order in the complex plane, J. Math. Anal. Appl., 372 (2010), 55-67.

18. E. Seneta, Regularly varying functions, Springer Berlin Heidelberg, 1976.

19. J. Tu, H.-X. Huang, Complex oscillation of linear differential equations with analytic coefficients of [p, q]-order in the unit disc, Comput. Methods and Funct. Theory, 15 (2015), ¹2, 225-246.

Pages
3-11
Volume
45
Issue
1
Year
2016
Journal
Matematychni Studii
Full text of paper
pdf
Table of content of issue