# Closing Lemma for Diffeomorphism (Dynamical Systems)

 Importance: Outstanding ✭✭✭✭
 Author(s): Charles Pugh
 Subject: Topology
 Keywords: Dynamics , Pertubation
 Posted by: Jailton Viana on: April 24th, 2013

\begin{conjecture} Let $f\in Diff^{r}(M)$ and $p\in\omega_{f}$. Then for any neighborhood $V_{f}\subset Diff^{r}(M)$ there is $g\in V_{f}$ such that $p$ is periodic point of $g$ \end{conjecture} There is an analogous conjecture for flows ( $C^{r}$ vector fields . In the case of diffeos this was proved by Charles Pugh for $r = 1$. In the case of Flows this has been solved by Sushei Hayahshy for $r = 1$ . But in the two cases the problem is wide open for $r > 1$

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## Bibliography

Dynamics beyond uniform hyperbolicity :\Springer [Encyclopaedia of Mathematical Sciences Volume 102, Mathematical Phisics,2005]

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