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On characteristic function of a meromorphic function and its derivative. (English) Zbl 0799.30018
Summary: In this paper relations between $$T(r,f)$$ and $$T(r,f^{(k)})$$ have been obtained. The results generalize and improve some theorems given by S. M. Shah,S. K. Singh, A. Edrei, V. N. Kulkarni, and H. S. Gopalakrishna.

##### MSC:
 30D30 Meromorphic functions of one complex variable, general theory 30D35 Value distribution of meromorphic functions of one complex variable, Nevanlinna theory