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Deficient values of entire functions and their derivatives

Authors: David Drasin, Guang Hou Zhang, Lo Yang and Allen Weitsman
Journal: Proc. Amer. Math. Soc. 82 (1981), 607-612
MSC: Primary 30D35
MathSciNet review: 614887
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Abstract: Let $ f(z)$ be entire and of finite order, $ {f^{(n)}}$ be the $ n$th derivative, and $ {\Delta _n}(f) = \Sigma \delta (a,{f^{(n)}})$, the sum of all deficient values of $ {f^{(n)}}$. The authors show that $ {\Delta _n}(f)$ can be strictly increasing.

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