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Alexandroff Manifolds and Homogeneous Continua

Published online by Cambridge University Press:  20 November 2018

A. Karassev ,
V. Todorov  and
V. Valov
A. Karassev
Affiliation:
Department of Computer Science and Mathematics, Nipissing University, North Bay, ON, P1B 8L7 e-mail: alexandk@nipissingu.ca veskov@nipissingu.ca
V. Todorov
Affiliation:
Department of Mathematics, UACG, Sofia, Bulgaria e-mail: vtt-fte@uacg.bg
V. Valov
Affiliation:
Department of Computer Science and Mathematics, Nipissing University, North Bay, ON, P1B 8L7 e-mail: alexandk@nipissingu.ca veskov@nipissingu.ca
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Abstract

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We prove the following result announced by the second and third authors: Any homogeneous, metric $ANR$ -continuum is a $V_{G}^{n}$ -continuum provided ${{\dim}_{G}}X\,=\,n\,\ge \,1$ and ${{\overset{\vee }{\mathop{H}}\,}^{n}}\left( X;\,G \right)\,\ne \,0$ , where $G$ is a principal ideal domain. This implies that any homogeneous $n$ -dimensional metric $ANR$ -continuum is a ${{V}^{n}}$ -continuum in the sense of Alexandroff. We also prove that any finite-dimensional cyclic in dimension $n$ homogeneous metric continuum $X$ , satisfying ${{\overset{\vee }{\mathop{H}}\,}^{n}}\left( X;\,G \right)\,\ne \,0$ for some group $G$ and $n\,\ge \,1$ , cannot be separated by a compactum $K$ with ${{\overset{\vee }{\mathop{H}}\,}^{n-1}}\left( K;\,G \right)\,=\,0$ and ${{\dim}_{G}}K\,\le \,n\,-\,1$ . This provides a partial answer to a question of Kallipoliti–Papasoglu as to whether a two-dimensional homogeneous Peano continuum can be separated by arcs.

Keywords

54F4554F15Cantor manifoldcohomological dimensioncohomology groupshomogeneous compactumseparatorVn -continuum

Information

Type
Research Article
Information
Canadian Mathematical Bulletin , Volume 57 , Issue 2 , 14 June 2014 , pp. 335 - 343
Copyright
Copyright © Canadian Mathematical Society 2014

Footnotes

The first author was partially supported by NSERC Grant 257231-09. The third author was partially supported by NSERC Grant 261914-08.

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