C$^{\ast }$-simplicity has no local obstruction
Forum of Mathematics, Sigma, Tome 10 (2022)
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In 2016, I solved a problem of de la Harpe from 2006: Is there a nondiscrete C$^{\ast }$-simple group? However the solution was not fully satisfactory, as the C$^{\ast }$-simple groups provided (and their operator algebras) are very close to discrete groups. All previously known examples are of this form. In this article I give yet another construction of nondiscrete C$^{\ast }$-simple groups. The statement in the title then follows. This in particular gives the first examples of nonelementary C$^{\ast }$-simple groups (in Wesolek’s sense).
@article{10_1017_fms_2022_5,
author = {Yuhei Suzuki},
title = {C$^{\ast }$-simplicity has no local obstruction},
journal = {Forum of Mathematics, Sigma},
publisher = {mathdoc},
volume = {10},
year = {2022},
doi = {10.1017/fms.2022.5},
language = {en},
url = {http://geodesic.mathdoc.fr/articles/10.1017/fms.2022.5/}
}
Yuhei Suzuki. C$^{\ast }$-simplicity has no local obstruction. Forum of Mathematics, Sigma, Tome 10 (2022). doi: 10.1017/fms.2022.5
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