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Published online by Cambridge University Press: 11 March 2020
In this paper we study a class ${\mathcal{Z}}_{H}$ of harmonic mappings on the open unit disk
$\mathbb{D}$ in the complex plane that is an extension of the classical (analytic) Zygmund space. We extend to the elements of this class a characterisation that is valid in the analytic case. We also provide a similar result for a closed separable subspace of
${\mathcal{Z}}_{H}$ which we call the little harmonic Zygmund space.