English

On recurrence in G-spaces

General Topology 2017-03-03 v1

Abstract

We introduce and analyze the following general concept of recurrence. Let GG be a group and let XX be a G-space with the action G×XXG\times X\longrightarrow X, (g,x)gx(g,x)\longmapsto gx. For a family F\mathfrak{F} of subset of XX and AFA\in \mathfrak{F}, we denote ΔF(A)={gG:gBA\Delta_{\mathfrak{F}}(A)=\{g\in G: gB\subseteq A for some BF, BA}B\in \mathfrak{F}, \ B\subseteq A\}, and say that a subset RR of GG is F\mathfrak{F}-recurrent if RΔF(A)R\bigcap \Delta_{\mathfrak{F}} (A)\neq\emptyset for each AFA\in \mathfrak{F}.

Cite

@article{arxiv.1703.00695,
  title  = {On recurrence in G-spaces},
  author = {Igor Protasov and Ksenia Protasova},
  journal= {arXiv preprint arXiv:1703.00695},
  year   = {2017}
}

Comments

$G$-space, recurrent subset, ultrafilters, Stone-$\check{C}$ech compactification

R2 v1 2026-06-22T18:33:23.445Z