发表机构
Institute of Mathematics of the Polish Academy of Sciences; University of Isfahan; Institute for Research in Fundamental Sciences (IPM); Alzahra University(波兰科学院数学研究所; 伊斯法罕大学; 基础科学研究所; 阿尔扎拉大学)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本文证明可数离散群Γ与Γ-单C*-代数A的约化交叉积具有广义Powers平均性质等价于其典范映射为唯一Γ-等变伪期望,并证明该性质可提升至I_Γ(A)的交叉积。
AI 中文摘要
设Γ为可数离散群,A为含单位元的Γ-单Γ-C*-代数。我们证明A⋊_rΓ具有广义Powers平均性质当且仅当典范映射A⋊_rΓ→I_Γ(A)是唯一的Γ-等变伪期望。我们还证明该平均性质可提升至I_Γ(A)⋊_rΓ,且平均系数仍属于A。
英文摘要
Let $Γ$ be a countable discrete group and let $A$ be a unital $Γ$-simple $Γ$-$C^*$-algebra. We prove that $A\rtimes_rΓ$ has the generalized Powers averaging property if and only if the canonical map $A\rtimes_rΓ\to I_Γ(A)$ is the unique $Γ$-equivariant pseudo-expectation. We also show that this averaging property lifts to $I_Γ(A)\rtimes_rΓ$, with the averaging coefficients still belonging to $A$.
Comments20 pages; comments are welcome