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All Colloquia & Seminars

Current Seminars

  1. DDC - Online Seminar: Diophantine stability and unsolvability

    Location: MSRI: Online/Virtual
    Speakers: Barry Mazur (Harvard University)

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

    Following Karl Rubin’s lecture last week we will consider the “relative Diophantine notion”: a field extension L/K is Diophantine Stable for a variety V defined over K if V acquires no new rational points passing from K to L. I will discuss results, heuristics, conjectures related to Diophantine Stability, and especially: applications to Hilbert’s Tenth Problem. This consists of both joint work with Karl Rubin; and also a DDC workshop project with Karl Rubin and Sasha Shlapentokh.

    Updated on Sep 17, 2020 09:50 AM PDT
  2. 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 Sep 17, 2020 10:07 AM PDT

Upcoming Seminars

  1. 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 Sep 24, 2020 01:39 PM PDT
  2. 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 Sep 24, 2020 01:39 PM PDT
  3. DDC/RAS - Career Development Seminar: Superpower Theory

    Location: MSRI: Online/Virtual
    Speakers: Wesley Calvert (Southern Illinois University), Johanna Franklin (Hofstra University), Timothy McNicholl (Iowa State University), Andrew Yarmola (Boston College)

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

     

    Abstract:
    So you teach a decent class.  Great.  Everybody does.  You prove a good theorem.  Everybody proves a good theorem.  What else have you got?  The market usually contains many jobs that focus on a small pool of candidates who have a specialized skill, and even in other positions, it is better to be memorable as “the one who…”  We’ll talk about some ways that people distinguish themselves and how to find and develop your own superpowers.

    Updated on Sep 23, 2020 11:24 AM PDT
  4. DDC - Valuation Theory: Deeply ramified fields and their relatives

    Location: MSRI: Online/Virtual
    Speakers: Franz-Viktor Kuhlmann (University of Szczecin)

    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

    Abstract:

    Starting from the model theory of tame fields developed in
        Kuhlmann, F.-V.: The algebra and model theory of tame valued fields, J. reine angew. Math. 719 (2016), 1-43,
    one main question is how the condition of tameness can be relaxed while preserving some structure theory that still could lead to good model theoretic results. A first step was made in
        Kuhlmann, F.-V. - Pal, K.: The model theory of separably tame fields, J. Alg. 447 (2016), 74-108,
    but these fields are still very close to tame fields. My approach to the question is to use a classification of the defects of valued field extensions. One of the two types types of defect has been identified as the more harmful, so the question arises: which classes of valued fields avoid the harmful defects? It turns out that a slight generalization of the deeply ramified fields does the job. We will introduce this class of valued fields as well as the deeply ramified fields and the so-called semitame fields.
    To cover all deeply ramified fields, it was crucial to generalize the classification of defects that was originally given only in the equal characteristic case to the mixed characteristic case. In a new development, this can now be done by a unified definition that does not need a case distinction, by identifying an interesting invariant of defect extensions of prime characteristic.
    In my talk I will also describe a challenging open problem: prove by purely valuation theoretical means the known fact that algebraic extensions of deeply ramified fields are again deeply ramified.
    All this contains no model theoretic results so far (in contrast to the theory of tame and separably tame fields). The aim is to build a structure theory that then, hopefully, can be used by model theorists to push beyond tame fields. I will mention in passing a relatively new result that indirectly is connected with model theory: valued fields with only finitely Artin-Schreier extensions (as are the NTP2 valued fields) are deeply ramified (and even semitame).

    Updated on Sep 23, 2020 09:04 AM PDT
  5. 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 Sep 24, 2020 01:39 PM PDT
  6. DDC Online Seminar: (Z,+) has a Borel complete reduct

    Location: MSRI: Online/Virtual
    Speakers: Michael Laskowski (University of Maryland)

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

    Abstract:

    For many (but not all) properties, a reduct of a structure M is no more complicated than M itself.  For example, if M is decidable, so are each of its reducts (in a reasonable language).  However, Borel completeness, which is a measure of ‘maximal complexity’ is not like this.  We recently showed that if M has uncountably many 1-types (with respect to its theory) then M has a Borel complete reduct.  No background is assumed -- at least the first half of the talk will be spent on defining reducts and Borel completeness, and giving algebraic examples.   This is joint work with Douglas Ulrich.

    Updated on Sep 24, 2020 09:19 AM PDT
  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 Sep 24, 2020 01:39 PM PDT
  8. Fellowship of the Ring, National Seminar: Tropical ideals

    Location: MSRI: Online/Virtual
    Speakers: Diane Maclagan (University of Warwick)

    To attend this seminar, you must register in advance, by clicking HERE.

     

    One consequence of the recent push to develop a scheme theory in tropical geometry has been the development of a tropical commutative algebra. This starts with the commutative algebra of semirings, but in order to get a theory that interacts with geometry, we are lead to impose some combinatorial, matroid-theoretic, conditions. I will introduce these ideas, and discuss the current state of our understanding.

    Updated on Sep 24, 2020 11:48 AM PDT
  9. DDC - Computability Theory: Generically computable structures

    Location: MSRI: Online/Virtual
    Speakers: Douglas Cenzer (University of Florida)

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

    Abstract:

    We define notions of generically and coarsely computable and computably enumerable structures.  There are two directions in which these notions could potentially trivialize: either all structures could have a densely computable copy or only those having a computable (or computably enumerable) copy.  We show that particular classes of structures realize each of these extremal conditions, while other classes realize neither of them.

    To further explore these concepts, we introduce a graded family of elementarity conditions for substructures, in which we require that the dense sets under consideration be a strong substructure of the original structure.  Here, again, for a given class the notion could trivialize in the same two directions, and we show that both are possible.  For each class we investigate, there is some n such that requiring Sigma_n-elementarity is enough to minimize the class of generically or densely computable structures, witnessing the essentially structural character of these notions.

    Updated on Sep 24, 2020 09:35 AM PDT
  10. 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 Sep 24, 2020 01:39 PM PDT
  11. RAS - Research Seminar (Part 2)

    Location: MSRI: Online/Virtual
    Speakers: Ursula Hamenstädt (Rheinische Friedrich-Wilhelms-Universität Bonn)

    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 17, 2020 09:24 AM PDT
  12. 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 09:34 AM PDT
  13. Fellowship of the Ring, National Seminar: Grothendieck's localization problem

    Location: MSRI: Online/Virtual

    To attend this seminar, you must register in advance, by clicking HERE.

     

    Let A -> B be a flat local map of noetherian complete local rings. Using Hironaka's resolution of singularities, Grothendieck and Dieudonné showed that if the closed fiber of the map A -> B is Cohen-Macaulay and if A is of equal characteristic zero, then all the fibers of A -> B are Cohen-Macaulay. Three decades later, Avramov and Foxby showed that the same statement holds without the characteristic assumption on A. Grothendieck's localization problem asks whether a similar statement holds with Cohen-Macaulayness replaced by other local properties of noetherian local rings. We solve Grothendieck's localization problem for all sufficiently well-behaved properties of noetherian local rings. Our proof provides a uniform treatment of previously known special cases of Grothendieck's problem, in particular giving a new proof of Avramov and Foxby's result. As an application, we show that if the closed fibers of a flat morphism of algebraic varieties are smooth, then all fibers are smooth.

    Updated on Sep 24, 2020 11:50 AM PDT
  14. RAS - Research Seminar (Part 2)

    Location: MSRI: Online/Virtual
    Speakers: Jeffrey Danciger (University of Texas, Austin)

    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 17, 2020 09:26 AM PDT
  15. 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 09:34 AM PDT
  16. Fellowship of the Ring, National Seminar:

    Location: MSRI: Online/Virtual

    To attend this seminar, you must register in advance, by clicking HERE.

    Updated on Sep 03, 2020 11:07 AM PDT
  17. 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 10, 2020 10:19 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 09:34 AM PDT
  19. Fellowship of the Ring, National Seminar:

    Location: MSRI: Online/Virtual

    To attend this seminar, you must register in advance, by clicking HERE.

    Updated on Sep 03, 2020 11:07 AM PDT
  20. 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 10, 2020 10:19 AM PDT
  21. 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 09:34 AM PDT
  22. Fellowship of the Ring, National Seminar:

    Location: MSRI: Online/Virtual

    To attend this seminar, you must register in advance, by clicking HERE.

    Updated on Sep 03, 2020 11:07 AM PDT
  23. 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 10, 2020 10:19 AM PDT
  24. 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 09:34 AM PDT
  25. Fellowship of the Ring, National Seminar:

    Location: MSRI: Online/Virtual

    To attend this seminar, you must register in advance, by clicking HERE.

    Updated on Sep 03, 2020 11:07 AM PDT
  26. 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 10, 2020 10:19 AM PDT
  27. 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 09:35 AM PDT
  28. Fellowship of the Ring, National Seminar:

    Location: MSRI: Online/Virtual

    To attend this seminar, you must register in advance, by clicking HERE.

    Updated on Sep 03, 2020 11:07 AM PDT
  29. 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 10, 2020 10:19 AM PDT
  30. 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 09:35 AM PDT
  31. Fellowship of the Ring, National Seminar:

    Location: MSRI: Online/Virtual

    To attend this seminar, you must register in advance, by clicking HERE.

    Updated on Sep 03, 2020 11:07 AM PDT
  32. 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 10, 2020 10:19 AM PDT
  33. 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 09:35 AM PDT
  34. 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 10, 2020 10:19 AM PDT
  35. 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 09:35 AM PDT
  36. Fellowship of the Ring, National Seminar:

    Location: MSRI: Online/Virtual

    To attend this seminar, you must register in advance, by clicking HERE.

    Updated on Sep 03, 2020 11:07 AM PDT
  37. 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 10, 2020 10:19 AM PDT
  38. 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
  39. 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
  40. 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
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Past Seminars

There are more then 30 past seminars. Please go to Past seminars to see all past seminars.