English

On character space of the algebra of BSE-functions

Functional Analysis 2017-12-19 v1

Abstract

Suppose that AA is a semi-simple and commutative Banach algebra. In this paper we try to characterize the character space of the Banach algebra CBSE(Δ(A))C_{\rm{BSE}}(\Delta(A)) consisting of all BSE-functions on Δ(A)\Delta(A) where Δ(A)\Delta(A) denotes the character space of AA. Indeed, in the case that A=C0(X)A=C_0(X) where XX is a non-empty locally compact Hausdroff space, we give a complete characterization of Δ(CBSE(Δ(A)))\Delta(C_{\rm{BSE}}(\Delta(A))) and in the general case we give a partial answer. Also, using the Fourier algebra, we show that CBSE(Δ(A))C_{\rm{BSE}}(\Delta(A)) is not a CC^*-algebra in general. Finally for some subsets EE of AA^*, we define the subspace of BSE-like functions on Δ(A)E\Delta(A)\cup E and give a nice application of this space related to Goldstine's theorem.

Keywords

Cite

@article{arxiv.1712.05920,
  title  = {On character space of the algebra of BSE-functions},
  author = {Mohammad Fozouni},
  journal= {arXiv preprint arXiv:1712.05920},
  year   = {2017}
}

Comments

8 pages, To appear in "Sahand Communications in Mathematical Analysis"