# A note on the certain differential polynomials

### From NZJM

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**New Zealand Journal of Mathematics**

**Vol.** 38, (2008), **Pages** 239-244

**Junfeng Xu**

Department of Mathematics

Wuyi University

Jiangmen

Guangdong 529020

P.R. CHINA

**Feng Lü**

Department of Mathematics

Shandong University

Jinan 250100

P.R. CHINA

**Abstract** In this paper we consider the zeros of the differential polynomials
*f*^{2} + *a**f*^{(k)} − *c* where *k* is a positive integer, and *a*,*c* are
non-zero constants. Our result improves a result of H.H. Chen and
corrects an error of Y. Xu whose result related to H.H. Chen.

**Keywords** Meromorphic function; differential polynomials; Nevanlinna theory

**Classification** (MSC2000) 30D35

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