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Upcoming Colloquia & Seminars

  1. DDC - Online Seminar: Measures on perfect PAC fields

    Location: MSRI: Online/Virtual
    Speakers: Zoé Chatzidakis (Centre National de la Recherche Scientifique (CNRS))

    To participate in this seminar, please register here: https://www.msri.org/seminars/25206

    Abstract: This is work in progress, joint with Nick Ramsey (UCLA).

     

    A conjecture, now disproved by Chernikov, Hrushovski, Kruckman, Krupinski, Pillay and Ramsey, asked whether any group with a simple theory is definably amenable. It is well known that the counting measure on finite fields gives rise to a non-standard counting measure on pseudo-finite fields (the infinite models of the theory of finite fields). It was unknown whether other PAC fields possessed a reasonable measure, and in this talk, we will show that some of them do, although the measure we define does not have all the nice properties of a counting measure when the field is not pseudo-finite.  This result can be used to show that if G is a group definable in an e-free perfect PAC field, then G is definably amenable.

    We hope to extend our results to the wider class of bounded perfect PAC fields.

    Updated on Nov 24, 2020 01:52 PM PST
  2. RAS - SOQUAGAT: Symmetries and surface detection for SL(2,C) character varieties of 3-manifolds

    Location: MSRI: Online/Virtual
    Speakers: Kathleen Petersen (Florida State University)

    To attend this seminar, please register here: https://www.msri.org/seminars/25205

    Abstract: Culler, Morgan, and Shalen pioneered the detection essential surfaces in 3-manifolds through SL(2,C) character varieties. I’ll discuss how symmetries of the 3-manifold affect this detection, concluding with some examples. This is joint work with Jay Leach.

    Updated on Nov 30, 2020 05:11 PM PST
  3. Tea for DDC Members and Participants

    Location: MSRI: Online/Virtual

    Tea for members and participants of the Decidability, definability and computability in number theory virtual program.

    To participate, please register here: https://www.msri.org/seminars/25206

    Updated on Nov 24, 2020 08:57 AM PST
  4. DDC - Diophantine Problems: Torsion values of sections, elliptical billiards and diophantine problems in dynamics

    Location: MSRI: Online/Virtual
    Speakers: Umberto Zannier (Scuola Normale Superiore)

    To participate in this seminar, please register here: https://www.msri.org/seminars/25206

    Abstract:

    We shall consider sections of (products of) elliptic schemes, and their "torsion values". For instance, what can be said
    of the complex numbers b for which (2, \sqrt{2(2-b)}) is torsion on y^2=x(x-1)(x-b)?
    In particular, we shall recall results of "Manin-Mumford type" and illustrate some applications to elliptical billiards. Finally, we shall frame these issues as special cases of a general question in arithmetic dynamics, which can be treated with different methods, depending on the context.

    (Most results refer to work with Pietro Corvaja and David Masser.)

    Updated on Dec 02, 2020 10:41 AM PST
  5. RAS - Research Seminar (Part 1): Harmonic quasi-isometric maps between surfaces

    Location: MSRI: Online/Virtual
    Speakers: Dominique Hulin (Université de Paris XI)

    To participate in this seminar, please register here: https://www.msri.org/seminars/25205

    Abstract: We prove that a harmonic quasi-isometric map between two pinched Hadamard surfaces is a quasi-conformal diffeomorphism, thus generalizing a theorem of Schoen-Yau. This is a joint work with Yves Benoist.

     

    Updated on Nov 30, 2020 10:30 AM PST
  6. RAS - Research Seminar (Part 2)

    Location: MSRI: Online/Virtual
    Speakers: Roman Sauer (Karlsruhe Institute of Technology)

    To participate in this seminar, please register here: https://www.msri.org/seminars/25205

    This is one of the research seminars for the RAS program, that distinguishes itself from the postdocs and program associates seminars in that speakers are chosen among Research Members, Research Professors with occasional outside speakers.

    Updated on Nov 30, 2020 10:31 AM PST
  7. Tea for DDC Members and Participants

    Location: MSRI: Online/Virtual

    Tea for members and participants of the Decidability, definability and computability in number theory virtual program.

    To participate, please register here: https://www.msri.org/seminars/25206

    Updated on Dec 03, 2020 10:35 AM PST
  8. Postdoc Lunch

    Location: MSRI: Online/Virtual
    Updated on Nov 25, 2020 11:29 AM PST
  9. Tea for DDC Members and Participants

    Location: MSRI: Online/Virtual

    Tea for members and participants of the Decidability, definability and computability in number theory virtual program.

    To participate, please register here: https://www.msri.org/seminars/25206

    Updated on Dec 03, 2020 10:35 AM PST
  10. DDC - Valuation Theory

    Location: MSRI: Online/Virtual

    Valuation theory plays a major part in the interaction between number theory and logic. In this seminar, a variety of topics from valuation theory, and in particular connections to model theory, will be discussed. There will be a strong emphasis on results involving the definability of valuations.

    To participate in this seminar, please register here: https://www.msri.org/seminars/25206

    Updated on Aug 31, 2020 09:36 AM PDT
  11. Tea for DDC Members and Participants

    Location: MSRI: Online/Virtual

    Tea for members and participants of the Decidability, definability and computability in number theory virtual program.

    To participate, please register here: https://www.msri.org/seminars/25206

    Updated on Dec 03, 2020 10:36 AM PST
  12. ADJOINT Research Seminar: Post-Lockdown Dynamics of COVID-19 in several key regions of the US

    Location: MSRI: Online/Virtual
    Speakers: Sherry Scott (MSOE)

    In the context of several key states in the U.S.A, we will review the basics of COVID-19 and consider the post-lockdown dynamics.  In particular we will discuss the main drivers of the disease and the drawbacks to a natural herd immunity strategy. This talk represents joint work with Kamal Barley, Keisha Cook and Abba Gumel.

    Updated on Dec 03, 2020 11:04 AM PST
  13. Tea for DDC Members and Participants

    Location: MSRI: Online/Virtual

    Tea for members and participants of the Decidability, definability and computability in number theory virtual program.

    To participate, please register here: https://www.msri.org/seminars/25206

    Updated on Dec 03, 2020 10:35 AM PST
  14. Tea for DDC Members and Participants

    Location: MSRI: Online/Virtual

    Tea for members and participants of the Decidability, definability and computability in number theory virtual program.

    To participate, please register here: https://www.msri.org/seminars/25206

    Updated on Dec 03, 2020 10:35 AM PST
  15. RAS - Research Seminar (Part 2)

    Location: MSRI: Online/Virtual

    To participate in this seminar, please register here: https://www.msri.org/seminars/25205

    This is one of the research seminars for the RAS program, that distinguishes itself from the postdocs and program associates seminars in that speakers are chosen among Research Members, Research Professors with occasional outside speakers.

    Updated on Sep 18, 2020 03:45 PM PDT
  16. Postdoc Lunch

    Location: MSRI: Online/Virtual
    Updated on Nov 25, 2020 11:30 AM PST
  17. RAS - PA Seminar

    Location: MSRI: Online/Virtual

    The PA seminar is a learning seminar for early career mathematicians (graduate student and postdocs).  Please only join the seminar if you are an early career mathematician.

    To participate, please email Tommaso Cremaschi or James Farre.

    Updated on Oct 06, 2020 08:53 AM PDT
  18. DDC - Valuation Theory

    Location: MSRI: Online/Virtual

    Valuation theory plays a major part in the interaction between number theory and logic. In this seminar, a variety of topics from valuation theory, and in particular connections to model theory, will be discussed. There will be a strong emphasis on results involving the definability of valuations.

    To participate in this seminar, please register here: https://www.msri.org/seminars/25206

    Updated on Aug 31, 2020 09:36 AM PDT
  19. Postdoc Lunch

    Location: MSRI: Online/Virtual
    Updated on Nov 25, 2020 11:30 AM PST
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