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arxiv: 1703.00695 · v1 · pith:OV43YTPDnew · submitted 2017-03-02 · 🧮 math.GN

On recurrence in G-spaces

classification 🧮 math.GN
keywords mathfrakdeltarecurrencesubsetsubseteqactionanalyzebigcap
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We introduce and analyze the following general concept of recurrence. Let $G$ be a group and let $X$ be a G-space with the action $G\times X\longrightarrow X$, $(g,x)\longmapsto gx$. For a family $\mathfrak{F}$ of subset of $X$ and $A\in \mathfrak{F}$, we denote $\Delta_{\mathfrak{F}}(A)=\{g\in G: gB\subseteq A$ for some $B\in \mathfrak{F}, \ B\subseteq A\}$, and say that a subset $R$ of $G$ is $\mathfrak{F}$-recurrent if $R\bigcap \Delta_{\mathfrak{F}} (A)\neq\emptyset$ for each $A\in \mathfrak{F}$.

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