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SUMMARY:New methods for left exact localizations of topoi - Mathieu Anel (
 Université Paris Diderot)
DTSTART:20180424T131500Z
DTEND:20180424T141500Z
UID:TALK104179@talks.cam.ac.uk
CONTACT:Tamara von Glehn
DESCRIPTION:This talk will be around the following question: given a map f
  in a topos E\, how to describe the left exact localization forcing f to b
 ecome an isomorphism ?\nThe classical answer is to generate an explicit (G
 rothendieck or Lawvere-Tierney) topology. But in the context of infinity-t
 opoi\, not every left exact localization is controlled by a topology.\nI w
 ill recall why and give a new explicit description of the left exact local
 isation generated by f.\nI will finish by presenting an alternative to the
  notion of site\, best suited for infinity-topoi.\nThis is part of a joint
  work with G. Biedermann\, E. Finster & A. Joyal.
LOCATION:MR4\, Centre for Mathematical Sciences
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