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arXiv 1504.04816math.OA
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关于内拟对角C* 代数的一个注记

A Note On Inner Quasidiagonal C*-Algebras

Qihui Li

摘要:

本文给出了可分内拟对角C* 代数的两个新刻画。在此基础上,证明了两个内拟对角C* 代数的单位全自由积仍是内拟对角的.作为应用,我们证明了满矩阵代数上两个内拟对角C* 代数的单位全自由积是内拟对角的.同时,证明了有限维C* 代数上两个AF代数的合并单位全自由积是内拟对角的,如果这两个AF代数中的每一个上都存在忠实的迹态,使得对公共子代数的限制一致.

英文摘要:

In the paper, we give two new characterizations of separable inner quasidiagonal C*-algebras. Base on these characterizations, we show that a unital full free product of two inner quasidiagonal C*-algebras is inner quasidiagonal again. As an application, we show that a unital full free product of two inner quasidiagoanl C*-algebras with amalgmation over a full matrix algebra is inner quasidiagonal. Meanwhile, we conclude that a unital full free product of two AF algebras with amalgamation over a finite-dimensional C*-algebra is inner quasidiagonal if there are faithful tracial states on each of these two AF algebras such that the restrictions on the common subalgebra agree.

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