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arXiv math/0605068math.CVmath.DG
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从B^n到B^N的真全纯映射的一个新空隙现象

A new gap phenomenon for proper holomorphic mappings from B^n into B^N

Xiaojun Huang, Shanyu Ji, Dekang Xu

摘要:

本文(Math.Res.Lett. 13(2006)。No 4,509-523),作者建立了退化秩复空间中球之间真全息映射的伪范式。这然后被用来给一个完整的特征,所有正常的全纯映射与几何秩一,其中,特别是,包括以下作为一个直接的应用:定理:从B^n到B^N的任意有理全纯映射若满足$4\le n\le N\le 3n-4$,则等价于D 'Angelo映射$$F_θ(z',w)=(z',(\cosθ)w,(\sinθ)z_1w, ..., (\sinθ)z_{n-1}w, (\sinθ)w^2, 0'), 0\le θ\leq π/2.$$。(但也是非常平凡的)事实是,从球面$\partial {B^n}$的一部分到球面$\partial {B^N}$的任何非常数有理CR映射都可以扩展为从$B^n$到$B^N$的真有理全纯映射($N\ge n\ge 2$)。利用作者在[HJX 05]中建立的合理性定理,可以看到上述定理(也是本文的主要定理)对于从一片$\partial {B^n}$到$\partial{B^N}$的任何非常数$C^3$ -光滑CR映射都同样成立。论文[Math. Res. Lett. 13(2006)。No.4,509-523]几个月前由数学研究快报在其主页上首次电子出版:http://www.mrlonline.org/mrl/0000-000-00/Huang-Ji-Xu2.pdf。(The期刊印刷版的pdf档案亦可于http://www.math.uh.edu/jianshanyuji/rank1.pdf下载。

英文摘要:

In this paper (Math. Res. Lett. 13 (2006). No 4, 509-523), the authors established a pseudo-normal form for proper holomoprhic mappings between balls in complex spaces with degenerate rank. This then was used to give a complete characterization for all proper holomorphic maps with geometric rank one, which, in particular, includes the following as an immediate application: Theorem: Any rational holomorphic map from B^n into B^N with $4\le n\le N\le 3n-4$ is equivalent to the D'Angelo map $$F_θ(z',w)=(z',(\cosθ)w,(\sinθ)z_1w, ..., (\sinθ)z_{n-1}w, (\sinθ)w^2, 0'), 0\le θ\leq π/2.$$ It is a well-known (but also quite trivial) fact that any non-constant rational CR map from a piece of the sphere $\partial {B^n}$ into the sphere $\partial {B^N}$ can be extended as a proper rational holomoprhic map from $B^n$ into $B^N$ ($N\ge n\ge 2$). By using the rationality theorem that the authors established in [HJX05], one sees that the the above theorem (and also the main theorem of the paper) holds in the same way for any non-constant $C^3$-smooth CR map from a piece of $\partial {B^n}$ into $\partial{B^N}$. The paper [Math. Res. Lett. 13 (2006). No 4, 509-523] was first electronically published by Mathematical Research Letters several months ago at its home website: http://www.mrlonline.org/mrl/0000-000-00/Huang-Ji-Xu2.pdf. (The pdf file of the printed journal version can also be downloaded at http://www.math.uh.edu/~shanyuji/rank1.pdf).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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