Equality of harmonic and analytic shear classes for normalized univalent mappings

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Let SH0\mathcal{S}^0_H be the class of normalized sense-preserving univalent harmonic mappings f=h+g‾f=h+\overline{g} in the unit disk with fz‾(0)=0f_{\overline z}(0)=0. Let S\mathcal{S} be the classical normalized analytic univalent class, and let SH0(S)\mathcal{S}^0_H(\mathcal{S}) denote the subclass for which some analytic shear belongs to S\mathcal{S}. Shear-class equality conjecture. For every f=h+g‾∈SH0f=h+\overline{g}\in\mathcal{S}^0_H, there exists at least one θ∈R\theta\in\mathbb{R} such that h+eiθg∈Sh+e^{i\theta}g\in\mathcal{S}; equivalently,

SH0=SH0(S).\mathcal{S}^0_H=\mathcal{S}^0_H(\mathcal{S}).

The conjecture asks whether every normalized univalent harmonic mapping admits an analytic univalent shear. The source gives no resolution, so the problem remains open.

References

Primary source

S. Ponnusamy and A. Sairam Kaliraj, “On the coefficient conjecture of Clunie and Sheil-Small on Univalent Harmonic Mappings”, arXiv:1403.5619 (2014).

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