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SUMMARY:Jeremy Hume (Carleton University)
DTSTART:20251015T190000Z
DTEND:20251015T200000Z
DTSTAMP:20260420T053359Z
UID:NYC-NCG/208
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/NYC-NCG/208/
 ">Characterization of zero singular ideal in non-Hausdorff groupoid C*-alg
 ebras</a>\nby Jeremy Hume (Carleton University) as part of Noncommutative 
 geometry in NYC\n\n\nAbstract\nNon-Hausdorff etale groupoids arise natural
 ly from interesting dynamical systems and as models of important classes o
 f $C^*$-algebras. One of the main obstacles in understanding the associate
 d $C^*$-algebras in terms of their groupoids is the existence of a possibl
 y non-zero ideal consisting of functions supported on meagre sets which\, 
 for instance\, obstructs characterizing simplicity in terms of the usual g
 roupoid properties in the Hausdorff setting. In this talk\, I discuss my r
 esult characterizing when this "singular" ideal is zero in terms of a grou
 poid property. I will discuss the methods I use in the proofs\, including 
 the use of the Hausdorff cover of a non-Hausdorff groupoid\, introduced by
  Timmermann\, and a new concept of "compressing" linear maps to *-homomorp
 hisms. This talk is based on my preprint https://arxiv.org/abs/2509.07262.
 \n
LOCATION:https://researchseminars.org/talk/NYC-NCG/208/
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