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Some inequalities of differential polynomials. (English) Zbl 1169.30314
Summary: We consider the value distribution of the differential polynomials \(f^nf^{(k)}-1\), where \(n\) \((\geq 2)\), \(k\) are positive integers, and obtain some estimates only by the reduced counting function.

MSC:
30D35 Value distribution of meromorphic functions of one complex variable, Nevanlinna theory
26D10 Inequalities involving derivatives and differential and integral operators
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