Estimation of derivatives for regular positive real part functions
AbstractIn this paper, we mainly discuss the problem of estimating the $n$th derivative of regular positive real part functions: $ g(z)=c_0+c_1z+\cdots+c_nz^n+\cdots $, which is regular in $ |z|<1 $ and $ \Re g(z)>0 $. With the principle of inductive method and the characters of regular positive real part functions, the estimation of the $n$th derivative for the function $ g(z) $ is presented. The derivative estimation for positive functions with real part has been solved completely.
How to Cite
Yuan, W., Chen, D., & Kang, H. (2005). Estimation of derivatives for regular positive real part functions. Tamkang Journal of Mathematics, 36(3), 193–197. https://doi.org/10.5556/j.tkjm.36.2005.111