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SUMMARY:Allen Knutson (Cornell)
DTSTART:20220128T200000Z
DTEND:20220128T210000Z
DTSTAMP:20260407T214921Z
UID:agstanford/76
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/agstanford/7
 6/">Resolutions of Richardson varieties\, stable curves\, and dual simplic
 ial spheres</a>\nby Allen Knutson (Cornell) as part of Stanford algebraic 
 geometry seminar\n\n\nAbstract\nThe combinatorics of a simple normal cross
 ings divisor determines a "dual" simplicial complex. Kollár and Xu showed
  that when this divisor is anticanonical\, the simplicial complex has the 
 rational homology of a sphere. I'll construct two resolutions-of-singulari
 ties of Richardson varieties (a slight generalization of Schubert varietie
 s)\, one using Bott-Samelson manifolds\, the other (requiring no choices!)
  using circle-equivariant stable curves. In each case the dual simplicial 
 complex is actually <b>homeomorphic</b> to a sphere.\n
LOCATION:https://researchseminars.org/talk/agstanford/76/
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