有负系数的半纯凸函数(英文)

Meromorphic Convex Functions with Negative Coefficients

中文摘要:

      本文论述了一些有关设施农业建筑设计参数、环境工程设备的调节控制指标的选定。提出农业气象学是农业建筑和环境工程学的重要基础学科之一。

英文摘要:

      Let σ_k(a) be the class of functions(?), regularin the punctured disk E={z:0<|z|<1} and satisfying Re(1+zf″(z)/f′(z))<-a(0≤a<1) for z∈ E. In this paper we obtain coefficient inequalities, distortion and closure Theorems for the class σ_k(a). Further we obtain the class preserving integral operator of the form F(z)=c∫₀¹u^cf(uz)du,(00 for the class σ_k(a). Conversely when F∈σ_k(a) the radius of convexity of f is obtained.