In this paper, we investigate higher-order linear differential equations with entire coefficients of iterated order. We improve and extend a result of Belaidi and Hamouda by using the estimates for the logarithmic derivative of a transcendental meromorphic function due to Gundersen and the Winman-Valiron theory. We also consider the nonhomogeneous linear differential equations by using the basic method and some lemmas from the present and other three authors.
Submitted February 21, 2006. Published July 19, 2006.
Math Subject Classifications: 34M10, 30D35.
Key Words: Linear differential equation; meromorphic function; iterated order; iterated convergence exponent.
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| Ting-Bin Cao |
Department of Mathematics
Jinan, 250100, China
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