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EMBEDDINGS OF FREE TOPOLOGICAL VECTOR SPACES

Part of: Special properties Fairly general properties Topological linear spaces and related structures

Published online by Cambridge University Press:  20 August 2019

ARKADY LEIDERMAN Open the ORCID record for ARKADY LEIDERMAN [Opens in a new window]  and
SIDNEY A. MORRIS Open the ORCID record for SIDNEY A. MORRIS [Opens in a new window]
ARKADY LEIDERMAN
Affiliation:
Department of Mathematics, Ben-Gurion University of the Negev, Beer Sheva, P.O.B. 653, Israel email [email protected]
SIDNEY A. MORRIS*
Affiliation:
Centre for Informatics and Applied Optimization, Federation University, Australia, P.O.B. 663, Ballarat, Victoria, 3353, Australia Department of Mathematics and Statistics, La Trobe University, Melbourne, Victoria, 3086, Australia email [email protected]
*
✉[email protected]
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Abstract

It is proved that the free topological vector space $\mathbb{V}([0,1])$ contains an isomorphic copy of the free topological vector space $\mathbb{V}([0,1]^{n})$ for every finite-dimensional cube $[0,1]^{n}$, thereby answering an open question in the literature. We show that this result cannot be extended from the closed unit interval $[0,1]$ to general metrisable spaces. Indeed, we prove that the free topological vector space $\mathbb{V}(X)$ does not even have a vector subspace isomorphic as a topological vector space to $\mathbb{V}(X\oplus X)$, where $X$ is a Cook continuum, which is a one-dimensional compact metric space. This is also shown to be the case for a rigid Bernstein set, which is a zero-dimensional subspace of the real line.

Keywords

free topological vector spacefree locally convex spacevariety of locally convex spacesembeddingCook continuumrigid Bernstein set

MSC classification

Primary: 46A03: General theory of locally convex spaces
Secondary: 54D50: $k$-spaces 54F15: Continua and generalizations
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 101 , Issue 2 , April 2020 , pp. 311 - 324
Copyright
© 2019 Australian Mathematical Publishing Association Inc.

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