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On Becker's univalence criterion. (arXiv:1705.05738v1 [math.CV])
来源于:arXiv
We study locally univalent functions $f$ analytic in the unit disc
$\mathbb{D}$ of the complex plane such that $|{f"(z)/f'(z)}|(1-|z|^2)\leq
1+C(1-|z|)$ holds for all $z\in\mathbb{D}$, for some $0<C<\infty$. If $C\leq
1$, then $f$ is univalent by Becker's univalence criterion. We discover that
for $1<C<\infty$ the function $f$ remains to be univalent in certain horodiscs.
Sufficient conditions which imply that $f$ is bounded, belongs to the Bloch
space or belongs to the class of normal functions, are discussed. Moreover, we
consider generalizations for locally univalent harmonic functions. 查看全文>>