A sufficient condition for starlikeness of order \(\alpha\)
Summary: We obtain a sufficient condition for starlikeness of order \(\alpha, | f'(z) - \lambda(f(z)/z) + \lambda - 1| < M = M_n(\lambda,\alpha)\), where \(\lambda \in [0,1], \alpha \in [0,1)\) and the function \(f(z) = z + a_{n + 1}z^{n+1} + \cdots\) is analytic in the unit disc \(U\).
scientific article; zbMATH DE number 1780295