关于理想 C $$^*$$ -补全和可亲和性的说明

Pub Date : 2024-05-10 DOI:10.1007/s00010-024-01077-x
Tomasz Kochanek
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引用次数: 0

摘要

对于离散群 G,我们考虑了某些序列的理想((\mathcal {I}\subset c_0(G)\) of sequences with prescribed rate of convergence to zero)。我们证明,在布朗和根特纳(Bull. London Math. Soc. 45:1181-1193,2013)的意义上,G 的全群 C\(^*\)-algebra 与 C\(^*\)-completion \(\textrm{C}^*_{mathcal {I}}(G)\)之间的相等性意味着 G 是可封闭的。
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A note on ideal C $$^*$$ -completions and amenability

For a discrete group G, we consider certain ideals \(\mathcal {I}\subset c_0(G)\) of sequences with prescribed rate of convergence to zero. We show that the equality between the full group C\(^*\)-algebra of G and the C\(^*\)-completion \(\textrm{C}^*_{\mathcal {I}}(G)\) in the sense of Brown and Guentner (Bull. London Math. Soc. 45:1181–1193, 2013) implies that G is amenable.

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