Mathematica Bohemica, Vol. 146, No. 3, pp. 315-332, 2021


Finite and infinite order of growth of solutions to linear differential equations near a singular point

Samir Cherief, Saada Hamouda

Received October 20, 2019.   Published online October 6, 2020.

Abstract:  In this paper, we investigate the growth of solutions of a certain class of linear differential equation where the coefficients are analytic functions in the closed complex plane except at a finite singular point. For that, we will use the value distribution theory of meromorphic functions developed by Rolf Nevanlinna with adapted definitions.
Keywords:  linear differential equation; growth of solution; finite singular point
Classification MSC:  34M10, 30D35


References:
[1] L. Bieberbach: Theorie der gewöhnlichen Differentialgleichungen auf funktionentheoretischer Grundlage dargestellt. Die Grundlehren der Mathematischen Wissenschaften 66. Springer, Berlin, 1965. (In German.) MR 0176133 | Zbl 0124.04603
[2] H. Fettouch, S. Hamouda: Growth of local solutions to linear differential equations around an isolated essential singularity. Electron. J. Differ. Equ. 2016 (2016), Paper No. 226, 10 pages. MR 3547415 | Zbl 1352.34113
[3] S. Hamouda: Finite and infinite order solutions of a class of higher order linear differential equations. Aust. J. Math. Anal. Appl. 9 (2012), Article No. 10, 9 pages. MR 2903775 | Zbl 1238.34152
[4] S. Hamouda: Properties of solutions to linear differential equations with analytic coefficients in the unit disc. Electron. J. Differ. Equ. 2012 (2012), Paper No. 177, 8 pages. MR 2991411 | Zbl 1254.34121
[5] S. Hamouda: Iterated order of solutions of linear differential equations in the unit disc. Comput. Methods Funct. Theory 13 (2013), 545-555. DOI 10.1007/s40315-013-0034-y | MR 3138352 | Zbl 1296.34175
[6] S. Hamouda: The possible orders of growth of solutions to certain linear differential equations near a singular point. J. Math. Anal. Appl. 458 (2018), 992-1008. DOI 10.1016/j.jmaa.2017.10.005 | MR 3724712 | Zbl 1382.34097
[7] W. K. Hayman: Meromorphic Functions. Oxford Mathematical Monographs. Clarendon Press, Oxford (1964). MR 0164038 | Zbl 0115.06203
[8] A. Ya. Khrystiyanyn, A. A. Kondratyuk: On the Nevanlinna theory for meromorphic functions on annuli. I. Mat. Stud. 23 (2005), 19-30. MR 2150985 | Zbl 1066.30036
[9] L. Kinnunen: Linear differential equations with solutions of finite iterated order. Southeast Asian Bull. Math. 22 (1998), 385-405. MR 1811183 | Zbl 0934.34076
[10] A. Kondratyuk, I. Laine: Meromorphic functions in multiply connected domains. Fourier Series Methods in Complex Analysis I. Laine University of Joensuu 10. Department of Mathematics, University of Joensuu, Joensuu (2006), 9-111. MR 2296161 | Zbl 1144.30013
[11] R. Korhonen: Nevanlinna theory in an annulus. Value Distribution Theory and Related Topics. Advances in Complex Analysis and Its Applications 3. Kluwer Academic Publishers, Boston (2004), 167-179. DOI 10.1007/1-4020-7951-6_7 | MR 2173300 | Zbl 1102.30025
[12] I. Laine: Nevanlinna Theory and Complex Differential Equations. De Gruyter Studies in Mathematics 15. W. de Gruyter, Berlin (1993). DOI 10.1515/9783110863147 | MR 1207139 | Zbl 0784.30002
[13] I. Laine, R. Yang: Finite order solutions of complex linear differential equations. Electron. J. Differ. Equ. 2004 (2004), Paper No. 65, 8 pages. MR 2057652 | Zbl 1063.30031
[14] M. E. Lund, Z. Ye: Logarithmic derivatives in annuli. J. Math. Anal. Appl. 356 (2009), 441-452. DOI 10.1016/j.jmaa.2009.03.025 | MR 2524280 | Zbl 1176.30080
[15] M. Tsuji: Potential Theory in Modern Function Theory. Chelsea Publishing Company, New York (1975). MR 0414898 | Zbl 0322.30001
[16] J. M. Whittaker: The order of the derivative of a meromorphic function. J. Lond. Math. Soc. 11 (1936), 82-87. MR 1574768 | Zbl 0014.02504
[17] L. Yang: Value Distribution Theory. Springer, Berlin (1993). DOI 10.1007/978-3-662-02915-2 | MR 1301781 | Zbl 0790.30018

Affiliations:   Samir Cherief, Saada Hamouda, Laboratory of Pure and Applied Mathematics, Department of Mathematics, Faculty of Exact Sciences and Computer Science, University of Mostaganem (UMAB), Site 2, Zaghloul, Mostaganem, Algeria, e-mail: samir.cherief@univ-mosta.dz, saada.hamouda@univ-mosta.dz


 
PDF available at: