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On a generalization of the Cartwright–Littlewood fixed point theorem for planar homeomorphisms
Published online by Cambridge University Press: 11 February 2016
Abstract
We prove a generalization of the fixed point theorem of Cartwright and Littlewood. Namely, suppose that $h:\mathbb{R}^{2}\rightarrow \mathbb{R}^{2}$ is an orientation preserving planar homeomorphism, and let
$C$ be a continuum such that
$h^{-1}(C)\cup C$ is acyclic. If there is a
$c\in C$ such that
$\{h^{-i}(c):i\in \mathbb{N}\}\subseteq C$, or
$\{h^{i}(c):i\in \mathbb{N}\}\subseteq C$, then
$C$ also contains a fixed point of
$h$. Our approach is based on Brown’s short proof of the result of Cartwright and Littlewood. In addition, making use of a linked periodic orbits theorem of Bonino, we also prove a counterpart of the aforementioned result for orientation reversing homeomorphisms, that guarantees a
$2$-periodic orbit in
$C$ if it contains a
$k$-periodic orbit (
$k>1$).
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- Research Article
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- © Cambridge University Press, 2016
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