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arXiv 1609.09453math.OAmath.KT
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连通C* 代数

Connective C*-algebras

Marius Dadarlat, Ulrich Pennig

摘要:

连通性是可分C* 代数的一个同伦不变量性质,它有三个显著的结果:不存在非平凡投影,拟对角性和用渐近态射对核C* 代数的KK-理论的一个更几何的实现.本文的目的是进一步研究连通C* 代数类。给出了正合和核可分C* 代数-代数连通性的新刻画,证明了连通可分核C* 代数-代数的扩张是连通的.我们建立了与某些群类相关的C* 代数-代数的连通性或缺乏连通性:虚阿贝尔群,线性连通幂零李群和线性连通半单李群。

英文摘要:

Connectivity is a homotopy invariant property of separable C*-algebras which has three notable consequences: absence of nontrivial projections, quasidiagonality and a more geometric realization of KK-theory for nuclear C*-algebras using asymptotic morphisms. The purpose of this paper is to further explore the class of connective C*-algebras. We give new characterizations of connectivity for exact and for nuclear separable C*-algebras and show that an extension of connective separable nuclear C*-algebras is connective. We establish connectivity or lack of connectivity for C*-algebras associated to certain classes of groups: virtually abelian groups, linear connected nilpotent Lie groups and linear connected semisimple Lie groups.

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