arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0711.0979math.DS
收藏

低维环面上的极小同胚

Minimal Homeomorphisms on Low-Dimension Tori

N. M. Dos Santos, R. UrzÚa-Luz

摘要:

本文研究环面$T^{n},$ $n<5.$的极小同胚(所有轨道是稠密的). $T^{n}$的同胚$ϕ$的线性部分是由$ϕ$在$T^{n}$的第一同调群上诱导的线性映射$L$.由Lefschetz不动点定理可知,若$ϕ$极小,则1是$L$的特征值.我们证明了如果$ϕ$是最小的,并且$n<5$则$L$是准单容量的,即,$L$的所有特征值都是单位根,相反,如果$L\in GL(n,\Z)$是拟幂幺的,1是$L$的特征值,则存在$T^{n}$的$ C^{\infty}$最小斜积同构$ϕ$,其线性部分正好是$L.$我们不知道这些结果是否对$n>4$成立。给出了任意维环面的光滑斜积仿射与仿射变换光滑共轭的一个充分条件。

英文摘要:

In this article we study minimal homeomorphisms(all orbits are dense) of the tori $T^{n},$ $n<5.$ The linear part of a homeomorphism $ϕ$ of $T^{n}$ is the linear mapping $L$ induced by $ϕ$ on the first homology group of $T^{n}$. It follows from the Lefschetz fixed point theorem that 1 is an eigenvalue of $L$ if $ϕ$ minimal. We show that if $ϕ$ is minimal and $n<5$ then $L$ is quasi-unipontent, i.e., all the eigenvalues of $L$ are roots of unity and conversely if $L\in GL(n,\Z)$ is quasi-unipotent and 1 is an eigenvalue of $L$ then there exists a $ C^{\infty}$ minimal skew-product diffeomorphism $ϕ$ of $T^{n}$ whose linear part is precisely $L.$ We do not know if these results are true for $n>4$. We give a sufficient condition for a smooth skew-product diffeomorphism of a torus of arbitrary dimension to be smoothly conjugate to an affine transformation.

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。

↑