Hilbert C*-modules and conditional expectations on crossed products

Hilbert C*-modules and conditional expectations on crossed products
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Hilbert C* 模块和交叉乘积的条件期望

DOI:
10.1017/s1446788700000100
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发表时间:
1996
期刊:
Journal of the Australian Mathematical Society. Series A. Pure Mathematics and Statistics
影响因子:
--
通讯作者:
M. Khoshkam
M. Khoshkam
中科院分区:
--
文献类型:
--
作者:
M. Khoshkam

文献摘要

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摘要 本文研究了叉积C*代数上某些条件期望的结构。特别地,我们证明条件期望 E: B → A 的索引是有限的,当且仅当从 B ⋊ G 到 A ⋊ G 的导出期望的索引是有限的,其中 G 是作用于 B 的离散群。
Abstract In this paper, we study the structure of certain conditional expectation on crossed product C*-algebra. In particular, we prove that the index of a conditional expectation E: B → A is finite if and only if the index of the induced expectation from B ⋊ G onto A ⋊ G is finite where G is a discrete group acting on B.