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All Colloquia & Seminars

Current Seminars

  1. GFA Postdoc Seminar: Complemented Brunn-Minkowski Inequalities

    Location: MSRI: Simons Auditorium
    Speakers: Liran Rotem (University of Minnesota, Twin Cities)

    Given a measure on R^n, the isoperimetric inequality asks for a sharp lower bound on the surface area of a set in terms of its measure. The classic case is the case of the Lebesgue measure, where the isoperimetric minimizers are Euclidean balls. 

    For some measures an isoperimetric inequality can be deduced from a suitable generalized Brunn-Minkowski inequality.  We will discuss such generalized inequalities and their use in proving isoperimetric inequalities. The goal is to present both old results (due to Borell in the 1970's) and newer results (due to E. Milman and myself).

    The talk is meant to be accessible to people from both programs.

    Updated on Oct 12, 2017 11:13 AM PDT
  2. GTC Postdoc Seminar: Colorful coverings of polytopes and piercing numbers of colorful d-intervals

    Location: MSRI: Simons Auditorium
    Speakers: Shira Zerbib Gelaki (University of Michigan)
    We prove a common generalization of Barany's Colorful Caratheodory theorem and the topological KKMS theorem due to Shapley. We apply our theorem to prove an upper bound on the covering numbers in families of colored d-intervals, extending results of Tardos and Kaiser. 
    Joint with Florian Frick. 
    Updated on Oct 12, 2017 10:56 AM PDT
  3. Geometry in Optimization

    Location: Calvin Hall Simons Institute, Room 116
    Speakers: Jamie Haddock (University of California, Davis), Emily Speakman
    2:00 - 3:30pm Michael Joswig  ``Tropical Geometry and Interior Point Methods''
    3:30 - 4:00pm Break
    4:00 - 4:30pm Jamie Haddock ``Minimum Norm Point on a Polytope: Wolfe’s algorithm is exponential''
    4:35 - 5:05pm Emily Speakman ``Convexification of polynomial functions’'
    Updated on Oct 18, 2017 11:40 AM PDT

Upcoming Seminars

  1. GTC Main Seminar: Spectrahedral Shadows

    Location: MSRI: Simons Auditorium
    Speakers: Claus Scheiderer (Universität Konstanz)

    A spectrahedron is an affine-linear section of the cone of positive semidefinite matrices. A spectrahedral shadow is a linear image of a spectrahedron. By means of interior point methods one can very effectively optimize linear functions over spectrahedral shadows (semidefinite programming). We will discuss examples and construction methods of spectrahedral shadows, and then turn to the recent disproof of the Helton-Nie conjecture, which stated that every convex semialgebraic set is a spectrahedral shadow. Explicit counter-examples will be given, and a number of related open questions will be addressed.

    Updated on Oct 16, 2017 05:54 PM PDT
  2. GFA Main Seminar: Small ball probabilities via isoperimetry

    Location: MSRI: Simons Auditorium
    Speakers: Peter Pivovarov (University of Missouri)

    Small ball probabilities (or anti-concentration inequalities) typically involve different tools  than those used for proving large deviation or concentration inequalities.   I will discuss a general method that leads to sharp small ball probabilities for quantities involving random vectors, their marginals, operator norms of random matrices and the volume of random convex sets. Various isoperimetric inequalities in convex geometry play a central role.  In particular,  stronger empirical versions in which stochastic dominance holds are well suited for small ball probabilities.  I will describe how techniques from convexity interface well with rearrangement inequalities such as the Rogers-Brascamp-Lieb-Luttinger inequality and Christ's version of the latter. (Based on joint work with G. Paouris).

    Updated on Oct 20, 2017 03:14 PM PDT
  3. Combinatorial Fixed Point Theorems Working Group: When Mr Sperner, Mr. Tucker, Mr. Helly, Mr. Caratheodory and, Mr. Tverberg decide to talk’

    Location: MSRI: Baker Board Room
    Speakers: Jesus De Loera (University of California, Davis)
    I recently co-wrote a long survey (with Goaoc, Meunier, and Mustafa) about these 5 fundamental Theorems in geometric topological combinatorics. My key point will be to outline some connections between these theorems; some known, some new, some are easy some are not. Please see survey at http://front.math.ucdavis.edu/1706.05975  People who send us comments, corrections and suggestions, will be rewarded !!
    Updated on Oct 20, 2017 08:38 AM PDT
  4. GFA Main Seminar: Small ball probabilities via isoperimetry

    Location: MSRI: Simons Auditorium
    Speakers: Peter Pivovarov (University of Missouri)

    Small ball probabilities (or anti-concentration inequalities) typically involve different tools  than those used for proving large deviation or concentration inequalities.   I will discuss a general method that leads to sharp small ball probabilities for quantities involving random vectors, their marginals, operator norms of random matrices and the volume of random convex sets. Various isoperimetric inequalities in convex geometry play a central role.  In particular,  stronger empirical versions in which stochastic dominance holds are well suited for small ball probabilities.  I will describe how techniques from convexity interface well with rearrangement inequalities such as the Rogers-Brascamp-Lieb-Luttinger inequality and Christ's version of the latter. (Based on joint work with G. Paouris).

    Updated on Oct 20, 2017 03:17 PM PDT
  5. GFA Young Researchers Seminar: Limits of inference and functional inequalities

    Location: MSRI: Simons Auditorium
    Speakers: Yair Shenfeld (Princeton University )

    How big is the entropy of a random vector? The Gaussian log-Sobolev inequality gives one answer but it is not always optimal. If a signal is transmitted through a noisy channel how much information can be extracted about the original signal? We show how these two questions are connected and how basic tools from Statistics/Signal Processing appear (sometimes in disguise) in the field of geometric and functional inequalities. Along the way we will make use of stochastic methods. (Ongoing work with Ramon van Handel.)

    Updated on Oct 19, 2017 10:02 AM PDT
  6. GTC Visions Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 28, 2017 08:48 AM PDT
  7. GFA Main Seminar: Improving concentration under convexity

    Location: MSRI: Simons Auditorium
    Speakers: Grigoris Paouris (Texas A & M University)

    Concentration of measure is a fundamental tool in high dimensional geometry and in modern probability. However, typically it fails to capture the behavior of high dimensional objects (like norms) when fine estimates are required, such as small deviation inequalities or small ball probabilities. However the convexity (or concavity) of the function can be used to get improved estimates. Applications to convex geometry will be presented. (This talk will be based on joint works with P. Pivovarov and P. Valettas)  

    Updated on Oct 20, 2017 03:20 PM PDT
  8. GFA Main Seminar: Improving concentration under convexity

    Location: MSRI: Simons Auditorium
    Speakers: Grigoris Paouris (Texas A & M University)

    Concentration of measure is a fundamental tool in high dimensional geometry and in modern probability. However, typically it fails to capture the behavior of high dimensional objects (like norms) when fine estimates are required, such as small deviation inequalities or small ball probabilities. However the convexity (or concavity) of the function can be used to get improved estimates. Applications to convex geometry will be presented. (This talk will be based on joint works with P. Pivovarov and P. Valettas)  

    Updated on Oct 20, 2017 03:21 PM PDT
  9. GFA Postdoc Seminar: Volume and covering

    Location: MSRI: Simons Auditorium
    Speakers: Beatrice-Helen Vritsiou (University of Michigan)
    Given a pair of convex bodies K, L, denote by N(K,L) the least number of copies of L whose union covers (or in other words contains) K. If we are allowed to linearly transform one of the bodies, can we bound both N(K,L) and N(L,K) well? Also, can the volume of the unit ball of an n-dimensional normed space and the volume of the unit ball of its dual both be very large or very small?
    In this talk, after we make these questions more precise, we will discuss results (old or more recent) which give answers to them, and which also show that for most intents and purposes these answers are just restating of the same fundamental underlying property.
    Updated on Oct 20, 2017 08:39 AM PDT
  10. GTC Postdoc Seminar: What is the realization space of a polytope?

    Location: MSRI: Simons Auditorium
    Speakers: Federico Castillo (University of California, Davis)

    We will first discuss when two polytopes are equivalent. There are many possible definitions, but through examples I'll motivate the most combinatorial one. Once we define a suitable equivalence, then we will consider the space of all polytopes equivalent to a given one. These spaces are wild. The talk will be flooded with graphic examples. Indeed, most of the strange phenomena can be explained in dimension 2. 

    Updated on Oct 19, 2017 01:21 PM PDT
  11. Writing Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Igor Pak (University of California, Los Angeles)
    Created on Oct 04, 2017 03:29 PM PDT
  12. GTC Graduate Seminar

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

    Location: MSRI: Simons Auditorium
    Speakers: Martin Henk (TU Berlin)

    The well-known  slicing problem in Convex Geometry asks whether there exists an absolute constant $c$ so that for every origin-symmetric convex body $K$  of volume 1 there is a hyperplane section of $K$ whose $(n − 1)$-dimensional volume is greater than $c$. Motivated by a question  of Alexander Koldobsky, we are studying a similar  slicing problem (and related problems) when the volume functional is  replaced by the lattice point enumerator.
    (Based on joint works with Matthew Alexander, Artem Zvavitch and Sören L. Berg) 

    Updated on Oct 16, 2017 01:18 PM PDT
  14. GFA Main Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:53 AM PDT
  15. Mathematical Research Culture Seminar

    Location: MSRI: Baker Board Room

    In the first seminar, on September 26, we will be discussing the culture of "brilliance" in mathematics research. We ask that everyone read the following Science Magazine article about a 2015 study on this topic: http://www.sciencemag.org/news/2015/01/belief-some-fields-require-brilliance-may-keep-women-out For anyone who is interested in reading in more depth about this, you can find the original article plus two responses attached.

    We will spend the first 15-20 minutes of the seminar holding small-group discussions about the article. We will spend the remaining seminar time sharing the results of these initial discussions and discussing ways in which these findings might impact our practices with regard to mentoring, collaboration, and public advocacy.
    Article 1  Article 2  Article 3

    Created on Sep 14, 2017 09:37 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 08:48 AM PDT
  20. GFA Main Seminar

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

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:58 AM PDT
  22. UC Berkeley Colloquium: Serge Lang Undergraduate Lecture: When the precision of mathematics meets the messiness of the world of people

    Location: 60 Evans Hall
    Speakers: Keith Devlin (Stanford University)

    http://events.berkeley.edu/index.php/calendar/sn/math.html?event_ID=110346

    Almost all mathematicians are attracted to the subject by its certainty and precision. It’s one of the most finely sharpened blades in the human cognitive armory. It rules supreme in many parts of Physics and Engineering. It is almost as precise when applied to the activities of large populations of living creatures, including humans, though the precision then is a statistical one that applies to the group as a whole. But can math be useful when applied to living creatures on a more local scale? The answer is “yes”, but the contribution mathematics can make shifts from “providing precise answers to specific questions” to “providing data that helps a domain expert make a decision”. These newer uses of mathematics can be traced back at least as far as the early days of probability theory (concepts such as “utility”), but became prevalent much more recently, with applications in the financial markets (for example, the Black-Scholes model for pricing derivatives), workplace study and design (including workplace communication), and intelligence analysis. I’ll give examples from the last two domains, both of which I have worked in. Unless you find your way into a university mathematics department after graduation, you may find yourself using mathematics in this kind of way.

    Updated on Sep 29, 2017 09:54 AM PDT
  23. Lattice Points Working group

    Location: MSRI: Simons Auditorium
    Updated on Sep 15, 2017 04:06 PM PDT
  24. GFA Postdoc Seminar

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

    Location: MSRI: Simons Auditorium
    Created on Aug 21, 2017 09:22 AM PDT
  26. GFA Postdoc Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 05, 2017 08:41 AM PDT
  27. GTC Postdoc Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 05, 2017 08:41 AM PDT
  28. GTC Graduate Seminar

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

    Location: MSRI: Simons Auditorium
    Updated on Aug 29, 2017 02:24 PM PDT
  30. GFA Main Seminar

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

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

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

    Location: MSRI: Simons Auditorium
    Updated on Sep 01, 2017 01:04 PM PDT
  34. GTC Visions Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 28, 2017 08:48 AM PDT
  35. GFA Main Seminar

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

    Location: MSRI: Simons Auditorium
    Created on Aug 18, 2017 11:58 AM PDT
  37. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Created on Sep 29, 2017 09:49 AM PDT
  38. GTC Graduate Seminar

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

    Location: MSRI: Baker Board Room
    Updated on Aug 29, 2017 02:24 PM PDT
  40. GTC Main Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 18, 2017 11:50 AM PDT
  41. GTC Visions Seminar

    Location: MSRI: Baker Board Room
    Updated on Sep 28, 2017 08:49 AM PDT
  42. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Created on Sep 29, 2017 09:49 AM PDT
  43. Lattice Points Working Group

    Location: MSRI: Baker Board Room
    Updated on Sep 15, 2017 04:08 PM PDT
  44. GTC Postdoc Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 21, 2017 09:22 AM PDT
  45. GTC Graduate Seminar

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

    Location: MSRI: Simons Auditorium
    Updated on Aug 29, 2017 02:23 PM PDT
  47. GFA Main Seminar

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

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

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

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

    Location: MSRI: Simons Auditorium
    Created on Sep 07, 2017 10:09 AM PDT
  52. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Created on Sep 29, 2017 09:49 AM PDT
  53. GTC Graduate Seminar

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

    Location: MSRI: Simons Auditorium
    Updated on Aug 29, 2017 02:24 PM PDT
  55. GFA Main Seminar

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

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

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

    Location: MSRI: Baker Board Room
    Updated on Sep 01, 2017 01:05 PM PDT
  59. GTC Visions Seminar

    Location: MSRI: Baker Board Room
    Updated on Sep 28, 2017 08:50 AM PDT
  60. GFA Main Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 18, 2017 11:59 AM PDT
  61. GFA Main Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 18, 2017 11:58 AM PDT
  62. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Created on Sep 29, 2017 09:49 AM PDT
  63. Lattice Points Working Group

    Location: MSRI: Baker Board Room
    Updated on Sep 15, 2017 04:09 PM PDT
  64. GFA Postdoc Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 21, 2017 09:21 AM PDT
  65. GTC Postdoc Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 21, 2017 09:22 AM PDT
  66. GTC Graduate Seminar

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

    Location: MSRI: Simons Auditorium
    Updated on Aug 29, 2017 02:24 PM PDT
  68. GFA Main Seminar

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

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

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

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

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

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

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

    Location: MSRI: Baker Board Room
    Updated on Sep 15, 2017 04:10 PM PDT
  76. GFA Postdoc Seminar

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

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

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

    Location: MSRI: Simons Auditorium
    Updated on Aug 29, 2017 02:24 PM PDT
  80. GFA Main Seminar

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

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

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

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

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

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

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

    Location: MSRI: Baker Board Room
    Updated on Sep 15, 2017 04:10 PM PDT
  88. GFA Postdoc Seminar

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

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

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

Past Seminars

seminar
  1. Seminar GTC Graduate Seminar

    Created on Aug 18, 2017 11:45 AM PDT
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.