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Texas A&M University
Mathematics

Events for 04/02/2019 from all calendars

Student/Postdoc Working Geometry Seminar

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Time: 1:00PM - 2:00PM

Location: BLOC 628

Speaker: A. Conner, TAMU

Title: Implementing border multi-graded apolarity


Seminar on Banach and Metric Space Geometry

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Time: 3:00PM - 4:00PM

Location: BLOC 220

Speaker: Gilles Lancien, Universite de Bourgogne Franche-Comte

Title: Concentration phenomenon vs non coarse embeddability

Abstract: We will discuss the coarse embeddability of the Hamming graphs and of Kalton's interlaced graphs into Banach spaces. Concentration inequalities for Lipschitz maps defined on these graphs have proven to be very important coarse invariants for Banach spaces. We will explain in each case, why they are different from the "non equi-coarse embeddability" of the corresponding family of graphs. These remarks are taken from joint works with C. Petitjean and A. Prochazka and with F. Baudier, P. Motakis and Th. Schlumprecht.


Douglas Lectures

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Time: 4:00PM - 5:00PM

Location: Blocker 117

Speaker: Vaughan Jones, Vanderbilt University

Title: An introduction to subfactors

Abstract: Von Neumann algebras are closed *-algebras of operators on Hilbert space. A factor is a von Neumann algebra whose center is just the scalar multiples of the identity. Murray and von Neumann discovered novel factors in the 1930’s. Among which are the II_1 factors whose Hilbert spaces admit a dimension function. Thus a subfactor N in M has an index [M:N] given by the dimension of M as a Hilbert space over N. A finer invariant is the principal graph of a subfactor, a graph whose norm is the square root of the index. I will list all subfactors of index less than 4 together with their indices and principal graphs.