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Colloquia & Seminars


Current Seminars

No current seminar

Upcoming Seminars

  1. Berkeley Math Dept. Colloquiua: Zimmer's conjecture: subexponential growth, measure rigidity and strong property (T)

    Location: 60 Evans Hall UC Berkeley (in the basement)
    Speakers: David Fisher (Indiana University)

    Lattices in higher rank simple Lie groups, like SL(n,R) for n>2, are known to be extremely rigid.  Examples of this are Margulis' superrigidity theorem, which shows they have very few linear representations, and Margulis' arithmeticity theorem, which shows they are all constructed via number theory.  Motivated by these and other results, in 1983 Zimmer made a number of conjectures about actions of these groups on compact manifolds.  After providing some history and motivation, I will discuss a very recent result, proving many cases of the main conjecture. While avoiding technical matters, I will try to describe some of the novel flavor of the proof. The proof has many surprising features, including that it uses hyperbolic dynamics to prove an essentially elliptic result and that it uses results on homogeneous dynamics, including Ratner's measure classification theorem, to prove results about inhomogeneous  system. This is joint work with Aaron Brown and Sebastian Hurtado. 

    Created on Aug 22, 2016 04:18 PM PDT
  2. A Preliminary Exploration of Mixed Reality as a Medium for Mathematical Collaboration

    Location: MSRI: Simons Auditorium

    “Mixed Reality” is a variant of Virtual Reality in which the physical world remains visible, while virtual objects seem to be added to the world.  HoloLens is a device that makes Mixed Reality experiences available in a headset form factor.  In this exploration, we have applied HoloLenses to the collaborative operation of Mathematica.  As a start, a source of data or a symbolic expression might be realized as a virtual poster or sculpture.  Then, other virtual object can be positioned in order to modify those sources.  For instance, virtual magnifying glasses might act as functions.  If a participant looks at a source through a magnifying glass, the source will be rendered as modified by a corresponding function.  Magnifying glasses can be combined into structures, so that one can move about in a room to see different sequences of functions applied, depending on virtual sightlines that pass through different sequences of functions.  The reason this is interesting is that multiple users can then explore a meta-structure of related mathematical expressions, a task that gets confusing in a 2D medium.  This work is an early exploration.  We hope to engage the mathematics community to discover how this type of interface might be relevant either to the work of professional mathematicians or to education and outreach.  (Yes, there will be a working demo for attendees to try.)

    Created on Aug 24, 2016 09:07 AM PDT
  3. Member Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 22, 2016 04:29 PM PDT
  4. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 24, 2016 08:42 AM PDT
  5. Graduate Student Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 22, 2016 04:28 PM PDT

Past Seminars

seminar
  1. Seminar Algebraic Vision

    Created on Jun 15, 2016 02:44 PM PDT
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.