Upcoming Seminars & Events

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April 24, 2017
3:00pm - 4:00pm
TBA - Dejan Gajic
Speaker: Dejan Gajic , Imperial College London
Location:
Fine Hall 314
April 25, 2017
2:30pm - 3:30pm
TBA - Amit Moscovich

Please note different day and location (Tuesday, McDonnell 102A).

Speaker: Amit Moscovich, Weizman Institute of Science
Location:
TBD
April 25, 2017
4:30pm - 5:30pm
TBA - Inna Zakharevich
Speaker: Inna Zakharevich , Cornell University
Location:
Fine Hall 322
April 26, 2017
2:30pm - 3:30pm
TBA - Joel Tropp
Speaker: Joel Tropp, Caltech
Location:
Fine Hall 224
April 26, 2017
3:00pm - 4:00pm
TBA - Jeremy Tyson
Speaker: Jeremy Tyson , University of Illinois at Urbana-Champaign
Location:
Fine Hall 314
April 26, 2017
4:30pm - 5:30pm
TBA - Vitaly Bergelson
Speaker: Vitaly Bergelson , Ohio State University
Location:
Fine Hall 314
April 27, 2017
12:31pm - 1:31pm
TBA - Ruixiang Zhang
Speaker: Ruixiang Zhang, Princeton University
Location:
Fine Hall 110
April 27, 2017
2:00pm - 3:30pm
On rank and isomorphism of von Neumann special flows

A von Neumann flow is a special flow over an irrational rotation of the circle and under a piecewise smooth roof function with a non-zero sum of jumps. Such flows appear naturally as special representations of Hamiltonian flows on the torus with critical points. We consider the class of von Neumann flows with one discontinuity. I will show that any such flow has infinite rank and that the absolute value of the jump of the roof function is a measure theoretic invariant. The main ingredient in the proofs is a Ranter type property of parabolic divergence of orbits of two nearby points in the flow direction.  Joint work with Adam Kanigowski.

Speaker: Anton Solomko , University of Bristol
Location:
Jadwin Hall 111
April 27, 2017
2:30pm - 3:30pm
Algorithms for Reducing the Computational Burden of cryo-EM

Please note different day and location (Thursday, McDonnell 102A).  Computational expense has long been a challenge for 3D structure determination in electron cryomicroscopy (cryo-EM).  This problem has become more pressing as resolutions have increased and the desire to separate conformational computational variations has required ever-larger datasets.  This talk presents two new algorithmic developments which, when coupled with modern GPU hardware, dramatically reduces the computational requirements for cryo-EM.  Given low-resolution starting structures, high resolution structures can now be obtained in as little as 10s of minutes on modest desktop workstations.  Further, despite the severe non-convexity of the objective function, these new refinement algorithms have shown themselves to be robust to local minima, enabling ab initio structure determination and 3D classification.  Together, these algorithms can produce ab initio high resolution structures in an hour or two.  This talk will describe the underlying algorithmic advances (stochastic optimization and branch-and-bound search) along with results from their implementation in the recently released cryoSPARC software package.

Speaker: Marcus Brubaker, University of Toronto
Location:
TBD
April 27, 2017
3:00pm - 4:00pm
TBA - Boris Botvinnik

This is a joint Algebraic Topology / Topology seminar.  

Speaker: Boris Botvinnik , University of Oregon
Location:
Fine Hall 322
April 27, 2017
4:30pm - 5:30pm
TBA - Boris Botvinnik

This is a joint Topology / Algebraic Topology seminar.

Speaker: Boris Botvinnik , University of Oregon
Location:
Fine Hall 314
April 27, 2017
4:30pm - 5:30pm
TBA - Ziyang Gao
Speaker: Ziyang Gao , Princeton University
Location:
Fine Hall 214
April 27, 2017
4:30pm - 5:30pm
TBA - Paolo Luzzatto-Fegiz
Speaker: Paolo Luzzatto-Fegiz , UC Santa Barbara
Location:
Fine Hall 322
May 1, 2017
2:30pm - 3:30pm
TBA - Afonso Bandeira

Please note different day and location (Monday, Fine 110.)

Speaker: Afonso Bandeira, NYU
Location:
Fine Hall 110
May 3, 2017
3:00pm - 4:00pm
TBA - Marco Guaraco
Speaker: Marco Guaraco , University of Chicago
Location:
Fine Hall 314
May 4, 2017
10:45am - 11:45am
TBA - Leonid Polterovich
Speaker: Leonid Polterovich , Tel Aviv University, Isreal
Location:
IAS Room S-101
May 4, 2017
12:30pm - 1:30pm
TBA - Jun Su
Speaker: Jun Su , Princeton University
Location:
Fine Hall 110
May 4, 2017
2:00pm - 3:30pm
TBA - Ilya Khayutin
Speaker: Ilya Khayutin , Princeton University
Location:
Jadwin Hall 111
May 4, 2017
3:00pm - 4:30pm
TBA - Maya Stein
Speaker: Maya Stein , U. Chile
Location:
Fine Hall 224
May 4, 2017
4:30pm - 5:30pm
TBA - Jon Wilkening (UC Berkeley)
Speaker: Jon Wilkening , UC Berkeley
Location:
Fine Hall 322

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