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SUMMARY:Alex Kumjian
DTSTART:20201002T150000Z
DTEND:20201002T163000Z
DTSTAMP:20260423T035615Z
UID:WSIPM/12
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/WSIPM/12/">P
 ushouts of groupoid extensions by abelian group bundles</a>\nby Alex Kumji
 an as part of Western Sydney\, IPM joint workshop on Operator Algebras\n\n
 \nAbstract\nGiven a groupoid extension of a locally compact Hausdorff grou
 poid by a bundle of abelian groups on which it acts\, we construct a pusho
 ut twist over the groupoid semidirect product of the groupoid acting on th
 e dual of the bundle regarded as a topological space.   We then show that 
 the C*-algebra of the original extension groupoid is isomorphic to the twi
 sted groupoid associated to the pushout.  We will also discuss examples.  
 This talk is based on current joint work with Marius Ionescu\, Jean Renaul
 t\, Aidan Sims and Dana Williams.\n
LOCATION:https://researchseminars.org/talk/WSIPM/12/
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