On harmonic combination of univalent functions

M. Obradović, S. Ponnusamy

Let $\mathcal{S}$ be the class of all functions $f$ that are analytic and univalent in the unit disk $\ID$ with the normalization $f(0)=f^{\prime }(0)-1=0$. Let $\mathcal{U}(\lambda )$ denote th…