Upcoming Seminars

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Title: Reading Between the Lines of Datacenter Logs
Seminar: Computer Science
Speaker: Dr. Nosayba El-Sayed of MIT
Contact: TBA
Date: 2018-02-20 at 1:00PM
Venue: Atwood Chemistry Building Room 240
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Abstract:
Designing datacenters that are reliable, energy-efficient, and capable of delivering high performance and high utilization is a nontrivial problem facing scientists, businesses, and governments alike. In this talk, I will demonstrate how analyzing large datasets from different organizations helped us uncover interesting (and often surprising) patterns in the behavior of systems and applications in these large-scale platforms. I will show how real-world data helped us tackle critical questions such as how does temperature impact server reliability in places like Google, or how well do users configure the computing jobs they submit to shared clusters (spoiler alert: not very well!). Finally, I will demonstrate how simple machine learning techniques can be leveraged to accurately predict job failures in datacenters, while using data that is easily collected in current platforms.
Title: Joint Athens--Atlanta Number Theory Seminar
Seminar: Algebra
Speaker: David Harbater and Jacob Tsimerman of
Contact: David Zureick-Brown, dzb@mathcs.emory.edu
Date: 2018-02-20 at 4:00PM
Venue: TBA
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Abstract:
Talks will be at the University of Georgia \\ \textbf{David Harbater} (University of Pennsylvania), 4:00 \\ Local-global principles for zero-cycles over semi-global fields \\ Classical local-global principles are given over global fields. This talk will discuss such principles over semi-global fields, which are function fields of curves defined over a complete discretely valued field. Paralleling a result that Y. Liang proved over number fields, we prove a local-global principle for zero-cycles on varieties over semi-global fields. This builds on earlier work about local-global principles for rational points. (Joint work with J.-L. Colliot-Th鬨ne, J. Hartmann, D. Krashen, R. Parimala, J. Suresh.) \\ \textbf{Jacob Tsimerman} (U. Toronto), 5:15 \\ Cohen-Lenstra heuristics in the Presence of Roots of Unity \\ The class group is a natural abelian group one can associated to a number field, and it is natural to ask how it varies in families. Cohen and Lenstra famously proposed a model for families of quadratic fields based on random matrices of large rank, and this was later generalized by Cohen-Martinet to general number fields. However, their model was observed by Malle to have issues when the base field contains roots of unity. We explain that in this setting there are naturally defined additional invariants on the class group, and based on this we propose a refined model in the number field setting rooted in random matrix theory. Our conjecture is based on keeping track not only of the underlying group structure, but also certain natural pairings one can define in the presence of roots of unity. Specifically, if the base field contains roots of unity, we keep track of the class group G together with a naturally defined homomorphism $G^*[n] \to G$ from the n-torsion of the Pontryagin dual of G to G. Using methods of Ellenberg-Venkatesh-Westerland, we can prove some of our conjecture in the function field setting.
Title: TBA
Colloquium: Algebra
Speaker: Jordan Ellenberg of University of Wisconsin-Madison
Contact: David Zureick-Brown, dzb@mathcs.emory.edu
Date: 2018-02-27 at 4:00PM
Venue: W304
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Abstract:
TBA
Title: TBA
Seminar: Algebra
Speaker: Nathan Kaplan of UC Irvine
Contact: David Zureick-Brown, dzb@mathcs.emory.edu
Date: 2018-03-27 at 4:00PM
Venue: W304
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Abstract:
TBA
Title: Patching and local-global principles for gerbes with an application to homogeneous spaces
Defense: Dissertation
Speaker: Bastian Haase of Emory University
Contact: Bastian Haase, bastian.haase@emory.edu
Date: 2018-04-02 at 4:00PM
Venue: W302
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Abstract:
Starting in 2009, Harbater and Hartmann introduced a new patching setup for semi-global fields, establishing a patching framework for vector spaces, central simple algebras, quadratic forms and other algebraic structures. In subsequent work with Krashen, the patching framework was refined and extended to torsors and certain Galois cohomology groups. After describing this framework, we will discuss an extension of the patching equivalence to bitorsors and gerbes. Building up on these results, we then proceed to derive a characterisation of a local- global principle for gerbes and bitorsors in terms of factorization. These results can be expressed in the form of a Mayer-Vietoris sequence in non-abelian hypercohomology with values in the crossed-module $G->Aut(G)$. After proving the local-global principle for certain bitorsors and gerbes using the characterization mentioned above, we conclude with an application on rational points for homogeneous spaces.
Title: TBA
Seminar: Algebra
Speaker: Jennifer Berg of Rice
Contact: David Zureick-Brown, dzb@mathcs.emory.edu
Date: 2018-04-03 at 4:00PM
Venue: W304
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Abstract:
TBA
Title: TBA
Colloquium: N/A
Speaker: Sherry Li of Lawrence Berkeley National Lab
Contact: Lar Ruthotto, lruthotto@emory.edu
Date: 2018-04-05 at 4:00PM
Venue: W201
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Abstract:
TBA
Title: TBA
Colloquium: Algebra
Speaker: K. Soundararajan of Stanford University
Contact: David Zureick-Brown, dzb@mathcs.emory.edu
Date: 2018-04-12 at 4:00PM
Venue: W304
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Abstract:
TBA
Title: TBA
Seminar: Algebra
Speaker: Brandon William of UC Berkeley
Contact: David Zureick-Brown, dzb@mathcs.emory.edu
Date: 2018-04-17 at 4:00PM
Venue: W304
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Abstract:
TBA
Title: TBA
Seminar: Algebra
Speaker: Frank Thorne of University of South Carolina
Contact: David Zureick-Brown, dzb@mathcs.emory.edu
Date: 2018-04-24 at 4:00PM
Venue: W304
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Abstract:
TBA