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arXiv 1607.05067math.CV
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关于某些星形函数的负幂和反系数的系数估计

On Coefficient Estimates of Negative Powers and Inverse Coefficients for Certain Starlike Functions

Md Firoz Ali, A. Vasudevarao

摘要:

对于$-1\le B<A\le 1$,令$\mathcal{S}^*(A,B)$表示$|z|<1$中满足从属关系$zf'(z)/f(z)\prec (1+Az)/(1+Bz)$的正规化解析函数类$f(z)= z+\sum_{n=2}^{\infty}a_n z^n$,$Σ^*(A,B)$是$|z|>1$中相应的亚纯函数类。对于$f\in\mathcal{S}^*(A,B)$和$λ>0$,我们将估计解析函数$(f(z)/z)^{-λ}$的泰勒系数$a_n(-λ,f)$的绝对值。利用这一点,我们将确定系数估计的逆类$\mathcal{S}^*(A,B)$和$Σ^*(A,B)$的功能。

英文摘要:

For $-1\le B<A\le 1$, let $\mathcal{S}^*(A,B)$ denote the class of normalized analytic functions $f(z)= z+\sum_{n=2}^{\infty}a_n z^n$ in $|z|<1$ which satisfy the subordination relation $zf'(z)/f(z)\prec (1+Az)/(1+Bz)$ and $Σ^*(A,B)$ be the corresponding class of meromorphic functions in $|z|>1$. For $f\in\mathcal{S}^*(A,B)$ and $λ>0$, we shall estimate the absolute value of the Taylor coefficients $a_n(-λ,f)$ of the analytic function $(f(z)/z)^{-λ}$. Using this we shall determine the coefficient estimate for inverses of functions in the classes $\mathcal{S}^*(A,B)$ and $Σ^*(A,B)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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