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arXiv 0704.3645math.OA
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有限深度C* 代数-代数包含的消去

Cancellation for inclusions of C*-algebras of finite depth

Ja A Jeong, Hiroyuki Osaka, N. Christopher Phillips, Tamotsu Teruya

摘要:

设B是有单位元的C* 代数,A是有单位元的子代数,E是B到A的条件期望,其指标为有限型,拟基为n元.则拓扑稳定秩满足\tsr(B)\leq \tsr(A)+ n - 1.作为应用,我们证明了如果C* 代数的单位包含\subset B具有指数-有限型和有限深度,且A是单的,具有稳定秩1和性质(SP),则B有消去.特别地,若A是稳定秩为1的单有单位C* 代数,且具有性质(SP),且有限群G作用于A,则交叉积具有消去性.另外,如果群是整数,在群作用是外作用且在K_0(A)上平凡的条件下,我们得到了消去。

英文摘要:

Let B be a unital C*-algebra, let A be a unital subalgebra, and let E be a conditional expectation from B to A with index-finite type and a quasi-basis of n elements. Then the topological stable rank satisfies \tsr (B) \leq \tsr (A) + n - 1. As an application, we show that if a unital inclusion A \subset B of C*-algebras has index-finite type and finite depth, and A is simple with stable rank one and Property (SP), then B has cancellation. In particular, if A is a simple unital C*-algebra with stable rank one and Property (SP), and a finite group G acts on A, then the crossed product has cancellation. Separately, if the group is the integers, we obtain cancellation under the additional hypotheses that the group action is outer and is trivial on K_0 (A).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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