Compact Subsets of the Glimm Space of a $C^*$-algebra

Details Compact Subsets of the Glimm Space of a $C^*$-algebra Compact Subsets of the Glimm Space of a $C^*$-algebra

2012-03-15

arxiv.org/abs/1203.3350v1

Mathematics

Operator Algebras

8 pages

Scientific paper

If $A$ is a $\sigma$-unital $C^*$-algebra and $a$ is a strictly positive element of $A$ then for every compact subset $K$ of the complete regularization $\mathrm{Glimm}(A)$ of $\mathrm{Prim}(A)$ there exists $\alpha > 0$ such that $K\subset \{G\in \mathrm{Glimm}(A) \mid \|a + G\|\geq \alpha\}$. This extends a 1974 result of J. Dauns to all $\sigma$-unital $C^*$-algebras. However, there is a $C^*$-algebra $A$ and a compact subset of $\mathrm{Glimm}(A)$ that is not contained in any set of the form $\{G\in \mathrm{Glimm}(A) \mid \|a + G\|\geq \alpha\}$, $a\in A$ and $\alpha > 0$.

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