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arXiv 0912.0344math.CVmath.DG
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与射影结构相关的几何不变量和单叶准则

Geometric invariants associated with projective structures and univalence criteria

Seong-A Kim, Toshiyuki Sugawa

摘要:

对于具有共形度量的射影Riemann曲面之间的非常数全纯映射,我们考虑了不变Schwarzian导数和一般虚阶的射影Schwarzian导数。我们表明,这两个数量相关的“施瓦茨导数”的度量的表面(至少对于虚拟订单2和3的情况下)。作为应用,我们给出了单位圆盘上亚纯函数关于虚阶为3的投射Schwarz导数的单叶性判据。

英文摘要:

For a nonconstant holomorphic map between projective Riemann surfaces with conformal metrics, we consider invariant Schwarzian derivatives and projective Schwarzian derivatives of general virtual order. We show that these two quantities are related by the "Schwarzian derivative" of the metrics of the surfaces (at least for the case of virtual orders 2 and 3). As an application, we give univalence criteria for a meromorphic function on the unit disk in terms of the projective Schwarzian derivative of virtual order 3.

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