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ON SOLUTIONS TO NONHOMOGENEOUS ALGEBRAIC DIFFERENTIAL EQUATIONS AND THEIR APPLICATION

Published online by Cambridge University Press:  24 September 2014

LIANG-WEN LIAO*
Affiliation:
Department of Mathematics, Nanjing University, Nanjing, PR China email [email protected]
ZHUAN YE
Affiliation:
Department of Mathematical Sciences, Northern Illinois University, DeKalb, IL 60115, USA email [email protected] Department of Mathematics, Taiyuan University of Technology, Taiyuan, Shanxi, PR China
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Abstract

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We consider solutions to the algebraic differential equation $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}f^nf'+Q_d(z,f)=u(z)e^{v(z)}$, where $Q_d(z,f)$ is a differential polynomial in $f$ of degree $d$ with rational function coefficients, $u$ is a nonzero rational function and $v$ is a nonconstant polynomial. In this paper, we prove that if $n\ge d+1$ and if it admits a meromorphic solution $f$ with finitely many poles, then

$$\begin{equation*} f(z)=s(z)e^{v(z)/(n+1)} \quad \mbox {and}\quad Q_d(z,f)\equiv 0. \end{equation*}$$
With this in hand, we also prove that if $f$ is a transcendental entire function, then $f'p_k(f)+q_m(f)$ assumes every complex number $\alpha $, with one possible exception, infinitely many times, where $p_k(f), q_m(f)$ are polynomials in $f$ with degrees $k$ and $m$ with $k\ge m+1$. This result generalizes a theorem originating from Hayman [‘Picard values of meromorphic functions and their derivatives’, Ann. of Math. (2)70(2) (1959), 9–42].

Type
Research Article
Copyright
Copyright © 2014 Australian Mathematical Publishing Association Inc. 

References

Alotaibi, A. and Langley, J. K., ‘The separation of zeros of solutions of higher order linear differential equations with entire coefficients’, Results Math. 63(3–4) (2013), 13651373.Google Scholar
Chen, H., ‘Yosida functions and Picard values of integral functions and their derivatives’, Bull. Aust. Math. Soc. 54(3) (1996), 373381.Google Scholar
Cherry, W. and Ye, Z., Nevanlinna’s Theory of Value Distribution, Springer Monographs in Mathematics (Springer, Berlin, 2001).Google Scholar
Chuaqui, M., Gröhn, J., Heittokangas, J. and Rättyä, J., ‘Zero separation results for solutions of second order linear differential equations’, Adv. Math. 245 (2013), 382422.Google Scholar
Clunie, J., ‘On a result of Hayman’, J. Lond. Math. Soc. 42 (1967), 389392.CrossRefGoogle Scholar
Gackstatter, F. and Laine, I., ‘Zur Theorie der gewöhnlichen Differentialgleichungen im Komplexen’, Ann. Polon. Math. 38(3) (1980), 259287.Google Scholar
Hayman, W. K., ‘Picard values of meromorphic functions and their derivatives’, Ann. of Math. (2) 70(2) (1959), 942.Google Scholar
Hayman, W. K., Meromorphic Functions (Clarendon Press, Oxford, 1964).Google Scholar
He, Y. and Laine, I., ‘The Hayman–Miles theorem and the differential equation (y )n = R (z, y)’, Analysis 10(4) (1990), 387396.Google Scholar
Heittokangas, J. and Rättyä, J., ‘Zero distribution of solutions of complex linear differential equations determines growth of coefficients’, Math. Nachr. 284(4) (2011), 412420.Google Scholar
Laine, I., ‘Complex differential equations’, in: Handbook of Differential Equations: Ordinary Differential Equations, Vol. IV (Elsevier/North-Holland, Amsterdam, 2008), 269363.Google Scholar
Li, P., ‘Entire solutions of certain type of differential equations II’, J. Math. Appl. 375 (2011), 310319.Google Scholar
Liao, L. W., Yang, C. C. and Zhang, J. J., ‘On meromorphic solutions of certain type of nonlinear differential equations’, Ann. Acad. Sci. Fenn. Math. 38 (2013), 581593.Google Scholar
Liao, L. W. and Ye, Z., ‘A class of second order differential equations’, Israel J. Math. 146 (2005), 281301.CrossRefGoogle Scholar
Mues, E., ‘Zur Wertverteilung von Differentialpolynomen’, Arch. Math. (Basel) 32(1) (1979), 5567.Google Scholar
Xu, Y., Wu, F. and Liao, L. W., ‘Picard values and normal families of meromorphic functions’, Proc. Roy. Soc. Edinburgh Sect. A 139(5) (2009), 10911099.Google Scholar
Yang, C. C. and Ye, Z., ‘Estimates of the proximate function of differential polynomials’, Proc. Japan Acad. Ser. A Math. Sci. 83(4) (2007), 5055.Google Scholar
Yang, C. C. and Yi, H. X., Uniqueness Theory of Meromorphic Functions (Science Press and Kluwer Academic, Beijing, 2003).Google Scholar
Zalcman, L., ‘Normal families: new perspectives’, Bull. Amer. Math. Soc. 35 (1998), 215230.Google Scholar
Zhang, Z. and Li, W., ‘The derivatives of polynomials of entire and meromorphic functions’, Chinese Ann. Math. Ser. A 15(2) (1994), 217223 (in Chinese).Google Scholar
Zhang, J. and Liao, L., ‘Admissible meromorphic solutions of algebraic differential equations’, J. Math. Anal. Appl. 397(1) (2013), 225232.Google Scholar