# Wydawnictwa / Czasopisma IMPAN / Studia Mathematica / Wszystkie zeszyty

## The Banach algebra of continuous bounded functions with separable support

### Tom 210 / 2012

Studia Mathematica 210 (2012), 227-237 MSC: Primary 46J10, 46J25, 46E25, 46E15; Secondary 54C35, 54D35, 46H05, 16S60. DOI: 10.4064/sm210-3-3

#### Streszczenie

We prove a commutative Gelfand–Naimark type theorem, by showing that the set $C_s(X)$ of continuous bounded (real or complex valued) functions with separable support on a locally separable metrizable space $X$ (provided with the supremum norm) is a Banach algebra, isometrically isomorphic to $C_0(Y)$ for some unique (up to homeomorphism) locally compact Hausdorff space $Y$. The space $Y$, which we explicitly construct as a subspace of the Stone–Čech compactification of $X$, is countably compact, and if $X$ is non-separable, is moreover non-normal; in addition $C_0(Y)=C_{00}(Y)$. When the underlying field of scalars is the complex numbers, the space $Y$ coincides with the spectrum of the $\hbox {C}^*$-algebra $C_s(X)$. Further, we find the dimension of the algebra $C_s(X)$.

#### Autorzy

• M. R. KousheshDepartment of Mathematical Sciences
Isfahan University of Technology
Isfahan 84156–83111, Iran
and
School of Mathematics
Institute for Research in Fundamental Sciences (IPM)
P.O. Box 19395–5746
Tehran, Iran
e-mail

## Przeszukaj wydawnictwa IMPAN

Zbyt krótkie zapytanie. Wpisz co najmniej 4 znaki.

Odśwież obrazek