Directional Convexity of Combinations of Harmonic Half-Plane and Strip Mappings

For $k=1,2$, let $f_k=h_k+\overline{g_k}$ be normalized harmonic right half-plane or vertical strip mappings. We consider the convex combination $\hat{f}=\eta f_1+(1-\eta)f_2 =\eta h_1+(1-\eta)h_2 +\overline{\overline{\eta} g_1+(1-\overline{\eta})g_2}$andthecombination$\tilde{f}=\eta h_1+(1-\eta)h_2+\overline{\eta g_1+(1-\eta)g_2}$\mathrm{.}Forreal$\eta$, the two mappings $\widehat{f}$ and $\tilde{f}$ are the same. We investigate the univalence and directional convexity of $\widehat{f}$ and $\tilde{f}$ for $\eta \in \mathbb{C}$. Some sufficient conditions are found for convexity of the combination $\tilde{f}$.