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arXiv 0907.2474math.OA
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AH代数上的Z-作用和AF代数上的Z^2-作用

Z-actions on AH algebras and Z^2-actions on AF algebras

Hiroki Matui

摘要:

考虑实秩为零且维数增长缓慢的单AH代数上的Z-作用(单自同构),证明了在某些技术假设下,Z-作用的一致外性蕴涵着Rohlin性质.此外,证明了在这样的C^*-代数上具有Rohlin性质的两个Z-作用是上循环共轭的,如果它们是渐近酉等价的。我们还证明了具有唯一迹的单AF代数上的局部近似内Z^2-作用和一致外Z^2-作用具有Rohlin性质,并利用OrderExt群作为分类不变量将它们分类为上循环共轭。

英文摘要:

We consider Z-actions (single automorphisms) on a unital simple AH algebra with real rank zero and slow dimension growth and show that the uniform outerness implies the Rohlin property under some technical assumptions. Moreover, two Z-actions with the Rohlin property on such a C^*-algebra are shown to be cocycle conjugate if they are asymptotically unitarily equivalent. We also prove that locally approximately inner and uniformly outer Z^2-actions on a unital simple AF algebra with a unique trace have the Rohlin property and classify them up to cocycle conjugacy employing the OrderExt group as classification invariants.

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