The Calkin algebra is ℵ1-universal

被引：0
作者：
Ilijas Farah
Ilan Hirshberg
Alessandro Vignati
机构：
[1] York University,Department of Mathematics and Statistics
[2] Ben Gurion University of the Negev,Department of Mathematics
[3] Bâtiment Sophie Germain,Institut de Mathématiques de Jussieu
来源：
Israel Journal of Mathematics | 2020年 / 237卷
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摘要：
We discuss the existence of (injectively) universal C*-algebras and prove that all C*-algebras of density character ℵ1 embed into the Calkin algebra, Q(H). Together with other results, this shows that each of the following assertions is relatively consistent with ZFC: (i) Q(H) is a 2ℵ0-universal C*-algebra. (ii) There exists a 2ℵ0-universal C*-algebra, but Q(H) is not 2ℵ0-universal, (iii) A 2ℵ0-universal C*-algebra does not exist. We also prove that it is relatively consistent with ZFC that (iv) there is no ℵ1-universal nuclear C*-algebra, and that (v) there is no ℵ1-universal simple nuclear C*-algebra.
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页码：287 / 309
页数：22
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