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October 27, 2021 (Wednesday), 2:00 pm

Dissertation Defense-New examples of irreducible subfactors of the hyperfinitte II_1 factor with rational, non-integer index

Hrvoje Stojanovic, Vanderbilt University
https://vanderbilt.zoom.us/j/99140969389

 

 

 

 

 

 

 

October 27, 2021 (Wednesday), 4:10 pm

Qualifying Exam – Some Optimal Periodic Configurations-SC1 1313

 Nate Tenpas, Vanderbilt University

October 27, 2021 (Wednesday), 4:10 pm

Topology & Group Theory Seminar

S-Machines can emulate Turing machines in quasilinear time.

Bogdan Chornomaz (Vanderbilt)
Topology & Group Theory Seminar page for Zoom meeting information

S-machines were first introduced in a 1997 paper (published only in 2002) by Sapir, Birget, and Rips, where they were used to prove that a finitely generated group G with a word problem of complexity T(n) can be embedded into a finitely presented group H with Dehn function of G in H at most T(n)4. This bound hinges on the fact that S-machine can emulate a Turing machine in time T(n)3. We improve this emulation bound to T(n)1+ε for any ε>0, which, hopefully, implies that the bound on the Dehn function can be improved to T(n)2+ε.

October 28, 2021 (Thursday), 2:00 pm

Dissertation Defense-Growth Of Dehn Twist and Pseudo-Anosov Conjugacy Classes in Teichmüller Space- Location: SC1312

Jiawei Han, Vanderbilt University

 

 

 

 

 

October 29, 2021 (Friday), 11:30 am

Subfactor Seminar

Irreducible inclusions of simple C*-algebras

Mikael Rordam, University of Copenhagen
Zoom ID 94393956397 Subfactor Seminar page for Zoom meeting information

There are several naturally occurring interesting examples of inclusions of simple C*-algebras with the property that all intermediate C*-algebras likewise are simple. By an analogy to von Neumann algebras, we refer to such inclusions as being C*-irreducible. We give an intrinsic characterization of C*-irreducible inclusions, and use this characterization to exhibit (and revisit) such inclusions, both known ones and new ones, arising from groups and dynamical systems. By a theorem of Popa, an inclusion of II_1-factors is C*-irreducible if and only if it is irreducible with finite Jones index. We explain how one can construct C*-irreducible inclusions from inductive limits. In a recent joint work with Echterhoff we consider when inclusions of the form $A^H \subseteq A \rtimes G$ are C*-irreducible, where G and H are groups acting on a C*-algebra A. Such inclusions in the setting of II_1 factors were considered by Bisch and Haagerup.

 

October 29, 2021 (Friday), 2:30 pm

PDE Seminar

PDE-Seminar- Title- TBD

Katrina Morgan, Northwestern University
PDE Seminar page for Zoom meeting information

November 3, 2021 (Wednesday), 4:10 pm

Computational Analysis Seminar

Computational Analysis- Title- TBD

Alex Cloninger, University of California – San Diego
Computational Analysis Seminar page for Zoom meeting information

November 5, 2021 (Friday), 2:30 pm

PDE Seminar

PDE- Title: TBA

Junyan Zhang, Johns Hopkins University
PDE Seminar page for Zoom meeting information

 

 

November 5, 2021 (Friday), 4:10 pm

Subfactor Seminar

Subfactor Seminar- Title TBD

Changying Ding, Vanderbilt University
Zoom ID 94393956397 Subfactor Seminar page for Zoom meeting information

November 10, 2021 (Wednesday), 4:10 pm

Computational Analysis Seminar

Computational Analysis- Title TBD

Bernhard Bodmann, University of Houston
Computational Analysis Seminar page for Zoom meeting information

November 12, 2021 (Friday), 2:30 pm

PDE Seminar

PDE Seminar- Title- TBD

Federico Pasqualotto, Duke University
PDE Seminar

November 12, 2021 (Friday), 2:30 pm

PDE Seminar

PDE- Title- TBD

Federico Pasqualotto, Duke University
PDE Seminar page for Zoom meeting information

November 12, 2021 (Friday), 4:10 pm

Subfactor Seminar

Subfactor Seminar- Title TBD

Corey Jones, North Carolina State University
Zoom ID 94393956397 Subfactor Seminar page for Zoom meeting information

November 17, 2021 (Wednesday), 4:10 pm

Computational Analysis Seminar

Computational Analysis- Title- TBD

Yvonne Ou, University of Delaware
Computational Analysis Seminar page for Zoom meeting information

November 19, 2021 (Friday), 4:10 pm

Subfactor Seminar

Subfactor Seminar- Title- TBD

Sorin Popa, UCLA
Subfactor Seminar page for Zoom meeting information Zoom ID 94393956397

December 1, 2021 (Wednesday), 4:10 pm

Computational Analysis Seminar

Computational Analysis- Title TBD

Peter Hinow, University of Wisconsin, Milwaukee
Computational Analysis Seminar page for Zoom meeting information

December 3, 2021 (Friday), 2:30 pm

PDE Seminar

PDE- Title TBD

Ákos Nagy, UC Santa Barbara
PDE Seminar page for Zoom meeting information

December 3, 2021 (Friday), 4:10 pm

Subfactor Seminar

Subfactor Seminar- Title TBD

James Tener, ANU Mathematical Sciences Institute
Zoom ID 94393956397 Subfactor Seminar page for Zoom meeting information