English

On proximal relations in transformation semigroups arising from generalized shifts

Dynamical Systems 2024-01-19 v1

Abstract

For a finite discrete topological space XX with at least two elements, a nonempty set Γ\Gamma, and a map φ:ΓΓ\varphi:\Gamma\to\Gamma, σφ:XΓXΓ\sigma_\varphi:X^\Gamma\to X^\Gamma with σφ((xα)αΓ)=(xφ(α))αΓ\sigma_\varphi((x_\alpha)_{\alpha\in\Gamma})= (x_{\varphi(\alpha)})_{\alpha\in\Gamma} (for (xα)αΓXΓ(x_\alpha)_{\alpha\in\Gamma}\in X^\Gamma) is a generalized shift. In this text for S={σψ:ψΓΓ}\mathcal{S}=\{\sigma_\psi:\psi\in\Gamma^\Gamma\} and H={σψ:ΓψΓ\mathcal{H}=\{\sigma_\psi: \Gamma\mathop{\rightarrow}\limits^{\psi}\Gamma is bijective}\} we study proximal relations of transformation semigroups (S,XΓ)(\mathcal{S},X^\Gamma) and (H,XΓ)(\mathcal{H},X^\Gamma). Regarding proximal relation we prove: P(S,XΓ)={((xα)αΓ,(yα)αΓ)XΓ×XΓ:βΓ(xβ=yβ)}P({\mathcal S},X^\Gamma)=\{((x_\alpha)_{\alpha\in\Gamma},(y_\alpha)_{\alpha\in\Gamma}) \in X^\Gamma\times X^\Gamma: \exists\beta\in\Gamma\:(x_\beta=y_\beta)\} and P(H,XΓ){((xα)αΓ,(yα)αΓ)XΓ×XΓ:{βΓ:xβ=yβ}P({\mathcal H},X^\Gamma)\subseteq \{((x_\alpha)_{\alpha\in\Gamma},(y_\alpha)_{\alpha\in\Gamma}) \in X^\Gamma\times X^\Gamma: \{\beta\in\Gamma:x_\beta=y_\beta\} is infinite~}{(x,x):xX}\}\cup\{ (x,x):x\in \mathcal{X}\}. \\ Moreover, for infinite Γ\Gamma, both transformation semigroups (S,XΓ)({\mathcal S},X^\Gamma) and (H,XΓ)({\mathcal H},X^\Gamma) are regionally proximal, i.e., Q(S,XΓ)=Q(H,XΓ)=XΓ×XΓQ({\mathcal S},X^\Gamma)=Q({\mathcal H},X^\Gamma)=X^\Gamma \times X^\Gamma, also for sydetically proximal relation we have L(H,XΓ)={((xα)αΓ,(yα)αΓ)XΓ×XΓ:{γΓ:xγyγ}L({\mathcal H},X^\Gamma)=\{((x_\alpha)_{\alpha\in\Gamma},(y_\alpha)_{\alpha\in\Gamma}) \in X^\Gamma\times X^\Gamma: \{\gamma\in\Gamma:x_\gamma\neq y_\gamma\} is finite}\}.

Keywords

Cite

@article{arxiv.1909.13100,
  title  = {On proximal relations in transformation semigroups arising from generalized shifts},
  author = {Fatemah Ayatollah Zadeh Shirazi and Amir Fallahpour and Mohammad Reza Mardanbeigi and Zahra Nili Ahmadabadi},
  journal= {arXiv preprint arXiv:1909.13100},
  year   = {2024}
}

Comments

8 pages

R2 v1 2026-06-23T11:29:02.288Z