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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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