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Closing Lemma for Diffeomorphism (Dynamical Systems)
Conjecture Let
and
. Then for any neighborhood
there is
such that
is periodic point of
and
. Then for any neighborhood
there is
such that
is periodic point of
There is an analogous conjecture for flows (
vector fields . In the case of diffeos this was proved by Charles Pugh for
. In the case of Flows this has been solved by Sushei Hayahshy for
. But in the two cases the problem is wide open for 
Bibliography
Dynamics beyond uniform hyperbolicity :\Springer [Encyclopaedia of Mathematical Sciences Volume 102, Mathematical Phisics,2005]
* indicates original appearance(s) of problem.
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