On Some Subclass of Harmonic Close-to-convex Mappings

Let $\mathcal{H}$ denote the class of harmonic functions $f$ in $\mathbb{D}:= \{z\in \mathbb{C}:|z| < 1\}$ normalized by $f(0) = 0 = f_z(0) -1$. For $α\geq 0$, we consider the following class $\mathcal{W}^0_{\mathcal{H}}(α):= \{f = h + \overline{g}\in\mathcal{H}: {\rm Re\,}(h'(z) + αz h''(z)) >|g'(z) + αz g''(z)|, \quad z\in \mathbb{D}\}.$ In this paper, we first prove the coefficient conjecture of Clunie and Sheil-Small for functions in the class $\mathcal{W}^0_{\mathcal{H}}(α)$. We also prove growth theorem, convolution, convex combination properties for functions in the class $\mathcal{W}^0_{\mathcal{H}}(α)$. Finally, we determine the value of $r$ so that the partial sums of functions in the class $\mathcal{W}^0_{\mathcal{H}}(α)$ are close-to-convex in $|z|<r$.

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