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Current Colloquia & Seminars

  1. Prismatic Cohomology: Introduction to prismatic cohomology

    Location: MSRI: Baker Board Room
    Speakers: Bhargav Bhatt (University of Michigan)

    Prismatic cohomology is a recently discovered mechanism for producing certain 1-parameter deformations of de Rham cohomology in arithmetic geometry. In this talk, I'll give the examples motivating this theory, give an outline of its construction, and mention a couple of applications.

    Updated on Feb 14, 2019 09:15 AM PST
  2. Women at MSRI lunch

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 03:50 PM PST
  3. DAG Seminar: Combinatorics in the ring of big Witt vectors

    Location: MSRI: Simons Auditorium
    Speakers: Sean Howe (Stanford University)

    Combinatorial principles like inclusion-exclusion can be obtained by decategorifying natural structures on the category of finite sets, whose Grothendieck ring is the ring of integers, Z. In this talk, we explain what happens when similar structures are decategorified from the category of almost-finite cyclic sets, whose Grothendieck ring is the big Witt ring, W(Z). A natural example of an almost-finite cyclic set is the set of \overline{Fq}-points of an algebraic variety over Fq, and the corresponding element in W(Z) is the zeta function of the variety; using this, we explain how combinatorics in the ring of big Witt vectors can be applied to prove theorems in arithmetic and motivic statistics.

    Updated on Feb 14, 2019 09:30 AM PST