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A Hopf Lemma for Holomorphic Maps into Hyperquadrics

Huang, Xiaojun et al.
arXiv (All) · Papers
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complex-variables
More than twenty years ago, Baouendi and the first author proved that a holomorphic map between hyperquadrics of the same signature is either totally degenerate or has a nonvanishing normal derivative for its normal component. This established a CR analogue of the classical Hopf lemma in arbitrary c
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