Picard values and derivatives of meromorphic functions

[摘要] References(12)Let f be a transcendental meromorphic function and R be a rational function, R{¬≡}0, and let k be a positive integer. In this paper, we obtain some results concerning the zeros of f(k)−R, which generalize and improve related results of Wang-Fang and Bergweiler-Pang.

[学科分类] 数学（综合）

[关键词] transcendental meromorphic function;normal family;Julia ezceptional function