Devaney chaos, Li-Yorke chaos, and multi-dimensional Li-Yorke chaos for topological dynamics
In this paper, we study various chaos of topological group or semigroup actions.
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arXiv subjects
Xinjia Tang
Publications and source records attributed to Xinjia Tang.
Szemeredi-type theorems for subsets of locally compact abelian groups of positive upper Banach density
By using ergodic theoretic techniques following Hillel Fürstenberg, we prove that measurable subsets of a locally compact abelian group of positive upper density contain Szemerédi-wise configurations defined by an arbitrary compact subset of the group.
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Variational principles for topological pressures on subsets
The goal of this paper is to define and investigate those topological pressures, which is an extension of topological entropy presented by Feng and Huang [13], of continuous transformations. This study reveals the similarity between many known results of topological pressure. More precisely, the investigation of the variational principle is given and related propositions are also described. That is, this paper defines the measure theoretic pressure $P_μ(T,f)$ for any $μ\in{\mathcal M(X)}$, and shows that $P_B(T,f,K)=\sup\bigr\{P_μ(T,f):μ\in{\mathcalM(X)},μ(K)=1\bigr\}$, where $K\subseteq X$ is a non-empty compact subset and $P_B(T,f,K)$ is the Bowen topological pressure on $K$. Furthermore, if $Z\subseteq X$ is an analytic subset, then $P_B(T,f,Z)=\sup\bigr\{P_B(T,f,K):K\subseteq Z\ \text{is compact}\bigr\}$. However, this analysis relies on more techniques of ergodic theory and topological dynamics.
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