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MPI-Oberseminar

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Organiser(s): 
C. Kaiser
Datum: 
Don, 2013-01-31 15:00 - Don, 2026-12-31 16:00
Location: 
MPIM Lecture Hall

The Oberseminar is a very long running seminar at MPI (‘Ober‘ standing for 'upper'). Its idea is that the guests of the MPI speak in this seminar (hopefully early in their stay) and get the chance to explain their work to the other guests.

Friedrich Hirzebruch Lecture

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Location: 
University Club Bonn

The annual Friedrich Hirzebruch Lecture is a series of lectures started in 2007 on the occasion of the 80th birthday of Prof. Friedrich Hirzebruch. The lectures address a general audience and aim at illustrating the relation between mathematics and art, society and other fields.

Geometric Representation Theory

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Organiser(s): 
Tobias Barthel, André Henriques, Joel Kamnitzer, Carl Mautner, Aaron Mazel-Gee, Kevin Mcgerty, Catharina Stroppel, Ben Webster
Datum: 
Mon, 2020-06-22 (All day) - Fre, 2020-06-26 (All day)

 

 

This will be a double conference held simultaneously at Perimeter Institute in Waterloo, Canada and Max Planck Institute in Bonn, Germany.

Organizers:

Tobias Barthel, André Henriques, Joel Kamnitzer, Carl Mautner, Aaron Mazel-Gee, Kevin Mcgerty, Catharina Stroppel, Ben Webster

"Pentagramma Mirificum". Hirzebruch lecture by Sergey Fomin on Friday, November 8, University Club Bonn

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Speaker: 
Sergey Fomin
Zugehörigkeit: 
University of Michigan
Datum: 
Fre, 2019-11-08 18:00 - 19:00
Location: 
University Club Bonn

Pentagramma Mirificum (the miraculous pentagram) is a beautiful geometric construction studied by Napier and Gauss. Its algebraic description yields the simplest instance of cluster transformations, a remarkable family of recurrences which arise in diverse mathematical contexts, from representation theory and enumerative combinatorics to theoretical physics and classical geometry (Euclidean, spherical, or hyperbolic).

2-torsion of class groups of multiquadratic fields

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Speaker: 
Carlo Pagano
Zugehörigkeit: 
University of Leiden/MPIM
Datum: 
Die, 2019-10-08 14:00 - 15:00
Location: 
MPIM Lecture Hall

The narrow class group of a number field is one of the most fundamental and, yet mysterious, objects in arithmetic. Its study was initiated by Gauss in 1801, using the language of quadratic forms. In his dissertation Gauss reported what still is one of the very few explicit results about the class group, namely an explicit description of the 2-torsion of the class group and the dual class group of a quadratic number field.

Mordell Weil rank jumps and the Hilbert property

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Speaker: 
Cecilia Salgado
Zugehörigkeit: 
Universidade Federal do Rio de Janeiro/MPIM
Datum: 
Die, 2019-10-01 14:00 - 15:00
Location: 
MPIM Lecture Hall

Let X be an elliptic surface with a section defined over a number field. Specialization theorems by N\'eron and Silverman imply that the rank of the Mordell-Weil group of special fibers is at least equal to the MW rank of the generic fiber. We say that the rank jumps when the former is strictly large than the latter. In this talk, I will discuss rank jumps for elliptic surfaces fibred over the projective line. If the surface admits a conic bundle we show that the subset of the line for which the rank jumps is not thin in the sense of Serre. This is joint work with Dan Loughran. 

New guests at the MPIM

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Speaker: 
Wenzhao Chen, Marco d'Addezio, Anthony Conway
Datum: 
Don, 2019-09-26 15:00 - 16:00
Location: 
MPIM Lecture Hall
Parent event: 
MPI-Oberseminar

Reaching every possible Chebyshev's bias in function fields

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Speaker: 
Lucile Devin
Zugehörigkeit: 
University of Montreal
Datum: 
Mit, 2019-09-25 14:30 - 15:30
Location: 
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

For every given integer m, Chebyshev's original interrogation is to investigate on the probability ("the bias") that given a random real number x, there are more prime numbers lower than x that are non-quadratic residues than that are quadratic residues modulo m.

Perturbing an isoradial triangulation

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Speaker: 
Jeanne Scott
Zugehörigkeit: 
Universidad de los Andes
Datum: 
Die, 2019-09-24 14:00 - 15:00
Location: 
MPIM Lecture Hall

The theory of random Delaunay triangulations of the plane has been proposed by
David-Eynard and others as a discrete model for 2-dimensional quantum gravity: In this model
the role of a continuous metric is played by a Delaunay triangulation while flat metrics
correspond to isoradial triangulations (on which one can define a theory of discrete analyticity).
Like the continuous case, the partition function for this discrete theory is given by a suitably
normalized determinant of a Beltrami-Laplace operator which varies with the choice of

Singularities old and new, II

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Speaker: 
Julius Shaneson
Zugehörigkeit: 
University of Pennsylvania
Datum: 
Mon, 2019-09-23 16:30 - 17:30
Location: 
MPIM Lecture Hall
Parent event: 
MPIM Topology Seminar

In the early days of glory, geometric topology scored many astonishing achievements in the theory of manifolds and submanifolds, a few samples of which will be mentioned.

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