Sylvester rank functions for amenable normal extensions

Sylvester rank functions for amenable normal extensions
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适合正常扩展的西尔维斯特等级函数

DOI:
10.1016/j.jfa.2020.108913
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发表时间:
2021
影响因子:
1.7
通讯作者:
Li, Hanfeng
Li, Hanfeng
中科院分区:
数学1区
文献类型:
--
作者:
Jiang, Baojie;Li, Hanfeng

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我们引入了一个有限逼近系统F的单位环R的顺从正规扩张S的概念,包括Gromov和Elek域上的顺从代数,顺从群的扭曲交叉积,以及具有域扩张的张量积。证明了R的每一个被S保持的西尔维斯特矩阵秩函数rk对S的一个西尔维斯特矩阵秩函数rk F都有一个标准扩张.在任意群的扭叉积和张量积具有域扩张的情况下,还证明了rkF连续依赖于rk。当顺从群在保迹态的有单位元C-代数上有扭作用时,我们还证明了由迹态构造的代数扭叉积上的两个自然西尔维斯特矩阵秩函数重合.
We introduce a notion of amenable normal extension S of a unital ring R with a finite approximation system F, encompassing the amenable algebras over a field of Gromov and Elek, the twisted crossed product by an amenable group, and the tensor product with a field extension. It is shown that every Sylvester matrix rank function rk of R preserved by S has a canonical extension to a Sylvester matrix rank function rk F for S. In the case of twisted crossed product by an amenable group, and the tensor product with a field extension, it is also shown that rk F depends on rk continuously. When an amenable group has a twisted action on a unital C⁎-algebra preserving a tracial state, we also show that two natural Sylvester matrix rank functions on the algebraic twisted crossed product constructed out of the tracial state coincide.
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