Abstract
Suppose that the linear differential equation
is such that the Aj are entire of finite order, and that A0 is the dominant coefficient in terms of growth. The existence of a fundamental set of solutions each having few zeros is shown to imply that the order of A0 is a positive integer.
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Langley, J.K. On the zeros of solutions of certain linear differential equations. Results. Math. 29, 276–279 (1996). https://doi.org/10.1007/BF03322224
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DOI: https://doi.org/10.1007/BF03322224