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SUMMARY:Henrik Wirzenius
DTSTART:20200721T130000Z
DTEND:20200721T140000Z
DTSTAMP:20260423T021112Z
UID:GOBA/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GOBA/2/">The
  quotient algebra of compact-by-approximable operators.</a>\nby Henrik Wir
 zenius as part of Groups\, Operators\, and Banach Algebras Webinar\n\n\nAb
 stract\nLet $K(X)$ denote the Banach algebra of compact operators acting o
 n a Banach space $X$ and $A(X)$ the uniform closure of the bounded finite 
 rank operators. In this talk I will describe joint work with Hans-Olav Tyl
 li (University of Helsinki) on the quotient algebra $K(X)/A(X)$ of compact
 -by-approximable operators. This is a radical Banach algebra that is poorl
 y understood\, mainly because $K(X)/A(X)$ is non-trivial only within the c
 lass of Banach spaces $X$ failing the approximation property. I will focus
  on the size and algebraic structure of $K(X)/A(X)$.\n
LOCATION:https://researchseminars.org/talk/GOBA/2/
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