Sharp starlike and convex radius for the differential operator of analytic functions

• Date: 2025
• Main Authors: Hu, Zhenyong, Srivastava, H. M., Zhang, Ying
• Format: Article
• Language: English
• Published: Institute of Mathematics, NAS of Ukraine 2025
• Online Access: https://umj.imath.kiev.ua/index.php/umj/article/view/7788
• Journal Title: Ukrains’kyi Matematychnyi Zhurnal

UDC 517.5 Under given coefficient conditions for analytic functions $f$ in the unit disk $\mathbf{D}$, we first obtain the starlike and convex radius  for the linear  combination of the differential operator  $zf'$ of analytic functions $f...