Abstract.
We prove the following regularity result: If \(M\subset {\Bbb C}^N\), \(M^\prime\subset{\Bbb C}^{N^{\prime}}\) are smooth generic submanifolds and M is minimal, then every Ck-CR-map from M into M′ which is k-nondegenerate is smooth. As an application, every CR diffeomorphism of k-nondegenerate minimal submanifolds in \({\Bbb C}^N\) of class Ck is smooth.
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Lamel, B. A C∞-Regularity Theorem for Nondegenerate CR Mappings. Monatsh. Math. 142, 315–326 (2004). https://doi.org/10.1007/s00605-003-0053-2
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DOI: https://doi.org/10.1007/s00605-003-0053-2