Geometric studies on the class $\mathcal{U}(\lambda )$

Milutin Obradović, Saminathan Ponnusamy, Karl-Joachim Wirths

The article deals with the family $\mathcal{U}(\lambda )$ of all functions $f$ normalized and analytic in the unit disk such that $\left|\right(z/f(z){)}^2{f}^{\prime }(z)-1|<\lambda$ for some $…