与伯努利双纽线相关的星形
Starlikeness associated with lemniscate of Bernoulli
摘要:
对于单位圆盘$\mathbb{D}=\{z:|z|<1\}$上的解析函数$f$满足$f(0)=0=f'(0)-1,$,我们得到了使$f$满足$|(zf'(z)/f(z))^2-1|<1.$的充分条件。导出了双纽线的可容许条件,并利用这些条件证明了主要结果。
英文摘要:
For an analytic function $f$ on the unit disk $\mathbb{D}=\{z:|z|<1\}$ satisfying $f(0)=0=f'(0)-1,$ we obtain sufficient conditions so that $f$ satisfies $|(zf'(z)/f(z))^2-1|<1.$ The technique of differential subordination of first or second order is used. The admissibility conditions for lemniscate of Bernoulli are derived and employed in order to prove the main results.
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