The rotation set and periodic points for torus homeomorphisms

Details The rotation set and periodic points for torus homeomorphisms The rotation set and periodic points for torus homeomorphisms

1996-05-07

arxiv.org/abs/math/9605228v1

Mathematics

Dynamical Systems

Scientific paper

We consider the rotation set $\rho(F)$ for a lift $F$ of an area preserving homeomorphism $f: \t^2\to \t^2$, which is homotopic to the identity. The relationship between this set and the existence of periodic points for $f$ is least well understood in the case when this set is a line segment. We show that in this case if a vector $v$ lies in $\rho(F)$ and has both co-ordinates rational, then there is a periodic point $x\in \t^2$ with the property that $$\frac{F^q(x_0)-x_0}q = v$$ where $x_0\in \re^2$ is any lift of $x$ and $q$ is the least period of $x$.

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