English

Realizing spaces as path-component spaces

General Topology 2020-04-14 v1 Algebraic Topology

Abstract

The path component space of a topological space XX is the quotient space π0(X)\pi_0(X) whose points are the path components of XX. We show that every Tychonoff space XX is the path-component space of a Tychonoff space YY of weight w(Y)=w(X)w(Y)=w(X) such that the natural quotient map Yπ0(Y)=XY\to \pi_0(Y)=X is a perfect map. Hence, many topological properties of XX transfer to YY. We apply this result to construct a compact space XR3X\subset \mathbb{R}^3 for which the fundamental group π1(X,x0)\pi_1(X,x_0) is an uncountable, cosmic, kωk_{\omega}-topological group but for which the canonical homomorphism ψ:π1(X,x0)πˇ1(X,x0)\psi:\pi_1(X,x_0)\to \check{\pi}_1(X,x_0) to the first shape homotopy group is trivial.

Keywords

Cite

@article{arxiv.1803.08556,
  title  = {Realizing spaces as path-component spaces},
  author = {Taras Banakh and Jeremy Brazas},
  journal= {arXiv preprint arXiv:1803.08556},
  year   = {2020}
}

Comments

12 pages

R2 v1 2026-06-23T01:02:21.276Z