English

On closed non-vanishing ideals in $C_B(X)$ II; compactness properties

Functional Analysis 2018-03-23 v1

Abstract

For a completely regular space XX, let CB(X)C_B(X) be the normed algebra of all bounded continuous scalar-valued mappings on XX equipped with pointwise addition and multiplication and the supremum norm and let C0(X)C_0(X) be its subalgebra consisting of mappings vanishing at infinity. For a non-vanishing closed ideal HH of CB(X)C_B(X) we study properties of its spectrum sp(H)\mathfrak{sp}(H) which may be characterized as the unique locally compact (Hausdorff) space YY such that HH and C0(Y)C_0(Y) are isometrically isomorphic. We concentrate on compactness properties of sp(H)\mathfrak{sp}(H) and find necessary and sufficient (algebraic) conditions on HH such that the spectrum sp(H)\mathfrak{sp}(H) satisfies (topological) properties such as the Lindel\"{o}f property, σ\sigma-compactness, countable compactness, pseudocompactness and paracompactness.

Keywords

Cite

@article{arxiv.1803.04672,
  title  = {On closed non-vanishing ideals in $C_B(X)$ II; compactness properties},
  author = {A. Khademi and M. R. Koushesh},
  journal= {arXiv preprint arXiv:1803.04672},
  year   = {2018}
}

Comments

12 pages