Some results on 1/n-homogeneity

Given a positive integer $n,$ a non-empty topological space is said to be $\frac{1}{n}$-homogeneous provided there are exactly $n$ orbits for the action of the group of homeomorphisms of the space onto itself. Now, for a non-empty topological space $X,$ the cone of $X$, $ \mathop{\rm Cone}(X),$ is the quotient space that is obtained by identifying all the points $(x,1)$ in $X\times [0,1]$ to a single point. The suspension of $X$, $\mathop{\rm Sus}(X),$ is the quotient space that is obtained by identifying all the points $(x,1)$ in $X\times [-1,1]$ to a single point, and all the points $(x,-1)$ to another point. The quotient space $Z_{X}$, is the space that is obtained by identifying all the points $(x,1)$ and all the points $(x,-1)$ in $X\times [-1,1]$ to one point. In this paper we determine general properties of the quotient spaces $Z_{X}$ and we investigate $\frac{1}{n}$-homogeneity on the quotient spaces $Z_{X}$, $\mathop{\rm Sus}(Z_X)$ and $\mathop{\rm Cone}(Z_X)$, among certain classes of compact metric spaces. In particular, we obtain the degree of homogeneity of the harmonic sequence, the $n$-rose finite graph and the space $X$ which is the union of a sequence $\{C_n\}^{\infty}_{n=1}$ of circles in the plane joined by a point and converging to a limit circle $C_0$.

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Publication Details

Journal
Matematychni Studii
Published
2025-06-24
DOI
https://doi.org/10.30970/ms.63.2.181-198
Primary Topic
Advanced Topology and Set Theory
Type
article
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article

Some results on 1/n-homogeneity

Alicia Santiago-Santos, Noé Trinidad Tapia-Bonilla
Matematychni Studii
Advanced Topology and Set Theory
article

Some results on 1/n-homogeneity

Alicia Santiago-Santos, Noé Trinidad Tapia-Bonilla
article en

Abstract

Given a positive integer $n,$ a non-empty topological space is said to be $\frac{1}{n}$-homogeneous provided there are exactly $n$ orbits for the action of the group of homeomorphisms of the space onto itself. Now, for a non-empty topological space $X,$ the cone of $X$, $ \mathop{\rm Cone}(X),$ is the quotient space that is obtained by identifying all the points $(x,1)$ in $X\times [0,1]$ to a single point. The suspension of $X$, $\mathop{\rm Sus}(X),$ is the quotient space that is obtained by identifying all the points $(x,1)$ in $X\times [-1,1]$ to a single point, and all the points $(x,-1)$ to another point. The quotient space $Z_{X}$, is the space that is obtained by identifying all the points $(x,1)$ and all the points $(x,-1)$ in $X\times [-1,1]$ to one point. In this paper we determine general properties of the quotient spaces $Z_{X}$ and we investigate $\frac{1}{n}$-homogeneity on the quotient spaces $Z_{X}$, $\mathop{\rm Sus}(Z_X)$ and $\mathop{\rm Cone}(Z_X)$, among certain classes of compact metric spaces. In particular, we obtain the degree of homogeneity of the harmonic sequence, the $n$-rose finite graph and the space $X$ which is the union of a sequence $\{C_n\}^{\infty}_{n=1}$ of circles in the plane joined by a point and converging to a limit circle $C_0$.

Matematychni StudiiVol. 63(2)
Technological University of the Mixteca (MX), Benito Juárez Autonomous University of Oaxaca (MX)
Openalex Percentile: Top 80%
Advanced Topology and Set Theory
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Some results on 1/n-homogeneity — Alicia Santiago-Santos, Noé Trinidad Tapia-Bonilla · Matematychni Studii (2025) | TGRS Research Map | TGRS