Logo

Mathematical Sciences Research Institute

Home > Scientific > Colloquia & Seminars

Colloquia & Seminars


Current Seminars

  1. GTC Graduate Seminar

    Location: MSRI: Baker Board Room
    Speakers: Giulia Codenotti (Freie Universität Berlin), Gleb Nenashev (University of Stockholm)
    Giulia Codenotti, The flatness theorem: on pancakes and other sweet things
    Gleb Nenashev, Cooperative colored chip-firing on the line
    Created on Aug 18, 2017 11:45 AM PDT
  2. GTC Main Seminar: On the Topology of Steel

    Location: MSRI: Simons Auditorium
    Speakers: Frank Lutz (TU Berlin)

    Polycrystalline materials, such as metals, are composed of crystal grains of varying size and shape. Typically, the occurring grain cells have the combinatorial types of 3-dimensional simple polytopes, and together they tile 3-dimensional space.

    We will see that some of the occurring grain types are substantially more frequent than others - where the frequent types turn out to be "combinatorially round". Here, the classification of grain types gives us,  as an application of combinatorial low-dimensional topology, a new  starting point for a topological microstructure analysis of steel.

    Updated on Oct 30, 2017 11:22 AM PDT
  3. GFA Main Seminar: Sidon Sets and Random Matrices

    Location: MSRI: Simons Auditorium
    Speakers: Gilles Pisier (Texas A & M University)

    We will recall some of the classical theory of Sidon sets of characters on compact groups (Abelian or not), and its connections with Gaussian random variables. We will then give several recent extensions of the notions of Sidon set, randomly Sidon set and subgaussian sequence in bounded orthonormal systems, triggered by Bourgain and Lewko’s recent work. In the second part of the talk, non-commutative analogues will be discussed, involving Sidon subsets in the dual of compact non-Abelian groups. The case of matricial systems, analogous to Fourier-Peter-Weyl series on compact groups, connects the subject to Random Matrix Theory. Several open problems will be discussed. All relevant papers are currently available on arxiv.

    Updated on Nov 13, 2017 03:15 PM PST
  4. GFA Main Seminar: Sidon Sets and Random Matrices

    Location: MSRI: Simons Auditorium
    Speakers: Gilles Pisier (Texas A & M University)

    We will recall some of the classical theory of Sidon sets of characters on compact groups (Abelian or not), and its connections with Gaussian random variables. We will then give several recent extensions of the notions of Sidon set, randomly Sidon set and subgaussian sequence in bounded orthonormal systems, triggered by Bourgain and Lewko’s recent work. In the second part of the talk, non-commutative analogues will be discussed, involving Sidon subsets in the dual of compact non-Abelian groups. The case of matricial systems, analogous to Fourier-Peter-Weyl series on compact groups, connects the subject to Random Matrix Theory. Several open problems will be discussed. All relevant papers are currently available on arxiv.

    Updated on Nov 13, 2017 03:15 PM PST

Upcoming Seminars

  1. GFA Young Researchers Seminar: Gaussian concentration and random unconditional structure

    Location: MSRI: Simons Auditorium
    Speakers: Petros Valettas (University of Missouri)

    The concentration of measure is a basic tool with various applications in geometric functional analysis. Unlike in the isomorphic theory, in the almost isometric context more delicate forms of it are required. In this talk we will discuss how one can take advantage of the linear structure of the normed space in order to establish almost optimal small deviation estimates for the corresponding norm. We will also present an application of the latter on estimates in Dvoretzky’s theorem. (Based on joint work with G. Paouris).

    Updated on Nov 16, 2017 01:44 PM PST
  2. GTC Graduate Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 18, 2017 11:45 AM PDT
  3. GTC Main Seminar: Spanning lattice polytopes and the Uniform position principle

    Location: MSRI: Simons Auditorium
    Speakers: Lukas Katthän (University of Minnesota)

    A lattice polytope is called spanning (or primitive) if its lattice points affinely span the ambient lattice. This property can be translated to a natural algebraic property of the Ehrhart ring of the polytope.
    In this talk, I will present recent joint work with Johannes Hofscheier and Benjamin Nill, where we use methods from commutative algebra and algebraic geometry to obtain new inequalities for the h^*-vector.
    This extends our previous work on the absence of inner zeros in the h^*-vector, as well as Hibi's inequality for polytopes with inner lattice points.

    Updated on Oct 30, 2017 11:24 AM PDT
  4. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:53 AM PDT
  5. Two Famous Betting Systems

    Location: MSRI: Baker Board Room
    Speakers: Stewart Ethian (University of Utah)

    Thirteen Against the Bank tells the story of how Norman Leigh claimed to have beaten the Casino Municipale at Nice using the "reverse" Labouchere system.  Was he lying?  We'll examine the likelihood of such a feat and others like it. 

    Dr. Stewart Ethier is a distinguished probabilist and expert in on the mathematics of gambling.  He resides in Las Vegas and consults for the casinos.

    Updated on Nov 17, 2017 01:45 PM PST
  6. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:53 AM PDT
  7. GTC Main Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 18, 2017 11:50 AM PDT
  8. GFA Young Researchers Seminar

    Location: MSRI: Baker Board Room
    Updated on Sep 01, 2017 01:05 PM PDT
  9. GTC Visions Seminar: Continuous Matroids revisited

    Location: MSRI: Simons Auditorium
    Speakers: Anders Björner (Royal Institute of Technology (KTH))

    There are several analogies between discrete and continuous mathematics that influence our thinking and understanding. For a very basic example, take the the Boolean lattice of subsets of a finite set with its continuous analog the measurable subsets of the unit interval.
    A general setting for such analogs, suggested by matroid theory and inspired by von Neumann’s work on "continuous geometries" from 1936, will be discussed. It is based on work from the 1980’s, much of it joint with L. Lovász, on continuous matroids, including continuous analogs of partitions and of field extensions.

    Updated on Nov 20, 2017 08:43 AM PST
  10. GFA Main Seminar

    Location: Space Science Lab
    Updated on Nov 20, 2017 11:49 AM PST
  11. GFA Main Seminar

    Location: Space Science Lab
    Updated on Nov 20, 2017 11:50 AM PST
  12. UC Berkeley Colloquium: Algebraic Structures on Polytopes

    Location: 60 Evans Hall
    Speakers: Federico Ardila (San Francisco State University)

    http://events.berkeley.edu/index.php/calendar/sn/math.html?event_ID=113270

    Generalized permutahedra are a beautiful family of polytopes with a rich combinatorial structure and strong connections to optimization. We study their algebraic structure: we prove they are the universal family of polyhedra with a certain “Hopf monoid" structure. This construction provides a unifying framework to organize and study many combinatorial families:
    1. It uniformly answers open questions and recovers known results about graphs, posets, matroids, hypergraphs, and simplicial complexes.
    2. It reveals that three combinatorial reciprocity theorems of Stanley and Billera–Jia–Reiner on graphs, posets, and matroids are really the same theorem.
    3. It shows that permutahedra and associahedra “know" how to compute the multiplicative and compositional inverses of power series.
    The talk will be accessible to undergraduates and will not assume previous knowledge of these topics.

    Updated on Nov 20, 2017 12:10 PM PST
  13. GTC Graduate Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 18, 2017 11:45 AM PDT
  14. GTC Main Seminar: On the treewidth of triangulated three-manifolds

    Location: MSRI: Simons Auditorium
    Speakers: Jonathan Spreer (Freie Universität Berlin)

    In graph theory, as well as three-manifold topology, a wide range of parameters exist to decide how "simple", or "thin", a given graph or three-manifold is. These width-type parameters, such as pathwidth or treewidth for graphs, or the concept of thin position for three-manifolds, play an important role when studying algorithmic problems in the field: There exist several topological problems -- some of them known to be computationally hard in general -- which become solvable in polynomial time as soon as the dual graph of the input triangulation has bounded treewidth. 
    In view of such algorithmic results, the question of whether there exists an explicit link between combinatorial concepts such as treewidth (applicable to a single input triangulation of a given three-manifold M) and results in three-manifold topology (applicable to all possible triangulations of M) has repeatedly been asked by researchers working in the computational branch of three-manifold topology.
    In this talk I will present such a link, stating that there exist families of three-manifolds not admitting triangulations of bounded treewidth.

    Updated on Nov 01, 2017 09:18 AM PDT
  15. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:53 AM PDT
  16. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:53 AM PDT
  17. GTC Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:50 AM PDT
  18. GFA Young Researchers Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 01, 2017 01:05 PM PDT
  19. GTC Visions Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 28, 2017 08:50 AM PDT
  20. GFA Main Seminar: Pisier's cotype dichotomy problem revisited

    Location: MSRI: Simons Auditorium
    Speakers: Gideon Schechtman (Weizmann Institute of Science)

    In an effort to renew interest in the dichotomy problem, I'll survey what is known and in particular tell you about an old/new result of Nicole Tomczak-Jaegermann and myself along the lines of a result of Bourgain but with some improvement. This gives the best known estimate concerning the dichotomy problem . I'll also try to suggest what should be done next.

    Updated on Nov 20, 2017 09:11 AM PST
  21. GFA Main Seminar: Pisier's cotype dichotomy problem revisited

    Location: MSRI: Simons Auditorium
    Speakers: Gideon Schechtman (Weizmann Institute of Science)

    In an effort to renew interest in the dichotomy problem, I'll survey what is known and in particular tell you about an old/new result of Nicole Tomczak-Jaegermann and myself along the lines of a result of Bourgain but with some improvement. This gives the best known estimate concerning the dichotomy problem . I'll also try to suggest what should be done next.

    Updated on Nov 20, 2017 09:11 AM PST
  22. Lattice Points Working Group

    Location: MSRI: Baker Board Room
    Updated on Oct 26, 2017 03:50 PM PDT
  23. GFA Postdoc Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 21, 2017 09:21 AM PDT
  24. GTC Postdoc Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 21, 2017 09:22 AM PDT
  25. GTC Graduate Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 18, 2017 11:45 AM PDT
  26. GTC Main Seminar

    Location: MSRI: Simons Auditorium
    Updated on Nov 01, 2017 09:18 AM PDT
  27. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:53 AM PDT
  28. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:53 AM PDT
  29. GTC Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:50 AM PDT
  30. GFA Young Researchers Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 01, 2017 01:06 PM PDT
  31. GTC Visions Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 28, 2017 08:50 AM PDT
  32. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:59 AM PDT
  33. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:58 AM PDT
  34. Lattice Points Working Group

    Location: MSRI: Baker Board Room
    Updated on Oct 26, 2017 03:51 PM PDT
  35. GFA Postdoc Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 21, 2017 09:21 AM PDT
  36. GTC Postdoc Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 21, 2017 09:22 AM PDT
  37. Seminar Sequence

    Location: MSRI: Simons Auditorium
    Created on Aug 31, 2017 03:27 PM PDT

Past Seminars

  1. Seminar Writing Seminar

    Created on Oct 04, 2017 03:29 PM PDT
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.