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SUMMARY:Bernhard Keller
DTSTART:20210525T140000Z
DTEND:20210525T150000Z
DTSTAMP:20260423T021237Z
UID:Freemath/52
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Freemath/52/
 ">Singular Hochschild cohomology and reconstruction of singularities</a>\n
 by Bernhard Keller as part of Free Mathematics Seminar\n\n\nAbstract\nWe s
 how that under a mild regularity assumption\, singular Hochschild cohomolo
 gy (also known as Tate-Hochschild cohomology) identifies with Hochschild c
 ohomology of the (dg enhanced) singularity category. In joint work with Zh
 eng Hua\, we apply this to the reconstruction of a (complete isolated) com
 pound Du Val singularity from its contraction algebra together with the ad
 ditional datum of a class in its zeroth Hochschild homology. This provides
  some evidence towards a conjecture by Donovan-Wemyss according to which t
 he contraction algebra alone determines such a singularity.\n
LOCATION:https://researchseminars.org/talk/Freemath/52/
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