定向三维流形上的参数刚性流
The parameter rigid flows on oriented 3-manifolds
摘要:
由闭流形$M$上的非奇异光滑向量场$X$定义的流称为参数刚性流,如果给定$M$上的任意实值光滑函数$f$,存在光滑函数$g$和常数$c$使得$f=X(g)+c$成立.我们证明了闭可定向三维流形上的参数刚性流与三维环面上的Kronecker流是光滑共轭的,且具有很差的逼近斜率。
英文摘要:
A flow defined by a nonsingular smooth vector field $X$ on a closed manifold $M$ is said to be parameter rigid if given any real valued smooth function $f$ on $M$, there are a smooth funcion $g$ and a constant $c$ such that $f=X(g)+c$ holds. We show that the parameter rigid flows on closed orientable 3-manifolds are smoothly conjugate to Kronecker flows on the 3-torus with badly approximable slope.
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