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{\Large Department of Mathematics, BGU}

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{\Huge Operator Algebras and Operator Theory}\\[0.2\baselineskip]

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\textbf{On} \emph{Wednesday, March  8, 2023}
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\textbf{At} \emph{10:00 -- 11:00}
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\textbf{In} \emph{Minus 101}

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{\large\scshape Shirly Geffen 
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  (Muenster)
}
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will talk about
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{\Large\bfseries Simplicity of reduced crossed products\par}
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\textsc{Abstract:}
Results from a few years ago of Kennedy and Schafhauser attempt to characterize 
simplicity of noncommutative reduced crossed products, under an assumption
which they call vanishing obstruction. However, this is a strong condition that
often fails, even in cases of finite groups acting on finite dimensional C\emph{-algebras. 
In this work, we give complete, two-way, C}-dynamical characterization, of when the crossed product is simple, 
in the setting of FC-hypercentral groups. This is a large class of amenable groups that, 
in the finitely-generated setting, is known to coincide with the set of groups with polynomial growth.

This is joint work in its early stages with Dan Ursu.





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{\bfseries Please Note the Unusual Day and Time!}
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