# Seminar

Series of talks or seminars.

## 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.

## 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.

This often leads to further mathematical interaction, and in any case it is very interesting to know what one's colleagues are working on.

This implies two things:

1. When you speak at the Oberseminar you should try to make sure that your talk is understandable and interesting to everyone, not just to the people in the same field. (We have many specialized seminars where you can present your work at a more technical level.)
2. Please always attend the Oberseminar, even if the title of the talk seems technical, because you know that the speaker is going to do a good job. The only reason for absence is that the talk is in your field and thus will be too easy for you.

We hope to see you at the Oberseminar!

Christian Kaiser (organizer)

The directors:
Prof. Ballmann
Prof. Faltings
Prof. Harder
Prof. Hirzebruch †
Prof. Manin
Prof. Teichner
Prof. Zagier

Upcoming talks

### Don, 24 Okt 2019

15:00 - 16:00
Emiliano Ambrosi, William Olson, Wee Chaimanowong

Past talks

For the abstracts click on the titles or see the list of abstracts.

### Don, 17 Okt 2019

15:00 - 16:00
Junxian Li, Peter Lambert-Cole, Quentin Guignard

### Don, 10 Okt 2019

15:00 - 16:00
Graham Hawkes, Maitreyee Kulkarni, Oleksiy Klurman

### Don, 26 Sep 2019

15:00 - 16:00
Wenzhao Chen, Marco d'Addezio, Anthony Conway

15:00 - 15:50
Rob Schneiderman

15:00 - 16:00
Shi Wang

### Don, 05 Sep 2019

15:00 - 16:00
Hongbo Yin, Dustin Clausen

15:00 - 16:00
David Gay

15:00 - 16:00
Grégory Ginot

### Don, 15 Aug 2019

15:00 - 16:00
Mahmoud Zeinalian

15:00 - 16:00
Filip Misev

### Don, 25 Jul 2019

15:00 - 16:00
Ralph Martin Kaufmann

15:00 - 16:00

### Don, 04 Jul 2019

15:00 - 16:00
David Hansen, Renato Bettiol

15:00 - 16:00
Noriko Yui

### Mit, 19 Jun 2019

15:00 - 16:00
Alexander Koldobsky

### Don, 13 Jun 2019

15:00 - 16:00
Damian Sawicki, Emily Norton, Severon Barmeier

### Don, 23 Mai 2019

15:00 - 16:00
Yuki Hirano, Michael Mertens, Rostislav Devyatov

15:00 - 16:00
Tam Nguyen Phan

15:00 - 16:00
Mark Penney

15:00 - 16:00
Nikolaos Tziolas

15:00 - 16:00
Anna Wienhard
13:45 - 14:45
Christian Bär

15:00 - 16:00
Ferrán Valdez

### Don, 04 Apr 2019

15:00 - 16:00
Vinoth Nandakamur, Jack Shotton

### Don, 28 Mär 2019

15:00 - 16:00
Jian Zhang, Laura Pertusi

15:00 - 16:00
Alexander Betts

### Don, 14 Mär 2019

15:00 - 16:00
Arnab Saha, Riccardo Iraso

### Don, 07 Mär 2019

15:00 - 16:00
Zhengfang Wang, Andriy Regeta

### Don, 21 Feb 2019

15:00 - 16:00
Stavros Garoufalidis

15:00 - 16:00
Rekha Biswal

### Don, 07 Feb 2019

15:00 - 16:00
Pablo Mauricio Zadunaisky, Rouven Frassek, Felix Wierstra

### Don, 24 Jan 2019

15:00 - 16:00
Yongsheng Zhang, Elizaveta Vishnyakova, Taiwang Deng

### Don, 17 Jan 2019

15:00 - 16:00
Hongyi Chu, Vladimir Mitankin, Dinh Tuan Huynh

### Don, 10 Jan 2019

15:00 - 16:00
Hisatoshi Kodani, Panagiotis Polymerakis, Ögmundur Eiriksson

### Don, 13 Dez 2018

15:00 - 16:00
Martin Gonzales, Evangelos Routi, Marc Stephan

### Don, 06 Dez 2018

15:00 - 16:00
Arthur Soulie, Roberto Fringuelli, Lorant Szegedy

### Don, 29 Nov 2018

15:00 - 16:00
Severin Charbonnier, Falk Beckert

### Don, 15 Nov 2018

15:00 - 16:00
Robin Bartlett, Luca Battistella, Lauren Bandklayder

### Don, 08 Nov 2018

15:00 - 16:00
Gautier Ponsinet, Carlo Pagano, Alexander Adam

### Don, 25 Okt 2018

15:00 - 16:00
Charles Fougeron, Christine McMeekin, Joost Nuiten

### Don, 18 Okt 2018

15:00 - 16:00
Alexandra Kjuchukova, Bingxiao Liu, Fosco Loregian

### Don, 11 Okt 2018

15:00 - 16:00
Daniel El-Baz, Stefano Marseglia, Diego Izquierdo

### Don, 04 Okt 2018

15:00 - 16:00
Magnus Carlson, Andrea Ferraguti, Matthew Bisatt

### Don, 27 Sep 2018

15:00 - 16:00
Sylvaine Lavau, Nicholas Cooney, Nima Rasekh

### Don, 20 Sep 2018

15:00 - 16:00
Noemie Combe, Tinhinane Azzouz, Alberto Cavallo

### Don, 13 Sep 2018

15:00 - 16:00
Sheng Meng, Xin Wang, Matthew Young

15:00 - 16:00
Travis Schedler

15:00 - 16:00
Ingrid Irmer

### Don, 16 Aug 2018

15:00 - 16:00
Tobias Dyckerhoff

### Don, 09 Aug 2018

15:00 - 16:00
Genki Ouchi, Benjamin Cooper, Mona Merling

## Reading group on geometric group theory

Posted in
Organiser(s):
Rachael Boyd, Shi Wang
Datum:
Don, 2019-10-24 10:15 - 11:45
Datum:
Don, 2019-10-31 10:15 - 11:45
Datum:
Don, 2019-11-07 10:15 - 11:45
Datum:
Don, 2019-11-14 10:15 - 11:45
Datum:
Don, 2019-11-21 10:15 - 11:45
Datum:
Don, 2019-11-28 10:15 - 11:45
Datum:
Don, 2019-12-05 10:15 - 11:45
Datum:
Don, 2019-12-12 10:15 - 11:45
Location:
MPIM Seminar Room

## Seminar "Arithmetic of Algebraic Groups"

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Organiser(s):
Günter Harder, Joachim Schwermer
Datum:
Die, 2019-10-15 10:15 - 11:45
Datum:
Die, 2019-10-22 10:15 - 11:45
Datum:
Die, 2019-10-29 10:15 - 11:45
Datum:
Die, 2019-11-05 10:15 - 11:45
Datum:
Die, 2019-11-12 10:15 - 11:45
Datum:
Die, 2019-11-19 10:15 - 11:45
Datum:
Die, 2019-11-26 10:15 - 11:45
Datum:
Die, 2019-12-03 10:15 - 11:45
Datum:
Die, 2019-12-10 10:15 - 11:45
Datum:
Die, 2019-12-17 10:15 - 11:45
Location:
MPIM Lecture Hall

Seminar "Arithmetic of Algebraic Groups"
covering all of the winter term. The topics dealt with are centered around arithmetic groups, their cohomology groups [in various disguises] and their relation with the theory of automorphic forms. Some of the results obtained have interesting applications in the latter theory, and, more generally, in number theory. Since arithmetic groups have a very distinctive geometric flavour [via their action on suitable symmetric spaces or other geometric objects] we will also look at the resulting quotient spaces from a geometric point of view, for example, by studying the construction of geometric cycles and related questions.

## Reading group on "Integer points in polyhedra"

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Organiser(s):
Gaetan Borot, Alessandro Giacchetto
Location:
MPIM Seminar Room

We will introduce the algebra of (indicator functions) of polyhedra and study its properties. Linear forms on this algebra produce functions on the set of polytopes (i.e. bounded polyhedra), that are compatible with set-theoretic decompositions of polyhedra. For polytopes, the lattice point count or the volume are examples of such linear forms.

## IMPRS seminar on various topics: Gamma-spaces and partial abelian monoids

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Datum:
Mit, 2019-10-09 16:30 - 18:00
Location:
MPIM Seminar Room

## IMPRS Thementag/Lectures by IMPRS students

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Organiser(s):
Christian Kaiser
Zugehörigkeit:
MPIM
Datum:
Mit, 2019-07-03 16:30 - 19:00
Location:
MPIM Lecture Hall

## A study group on Milnor invariants

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Organiser(s):
Danica Kosanovich
Zugehörigkeit:
MPIM
Datum:
Mit, 2019-07-03 14:00 - Fre, 2019-07-05 17:30
Location:
MPIM Seminar Room

## IMPRS seminar on various topics: infinity-categories

Posted in
Organiser(s):
Christian Kaiser
Zugehörigkeit:
MPIM
Datum:
Mit, 2019-06-05 14:15 - 15:45
Location:
MPIM Seminar Room

## Seminar on Weighted Hurwitz numbers and topological recursion

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Organiser(s):
Dan Betea and Danilo Lewanski

## IMPRS seminar on various topics: operads

Posted in
Organiser(s):
Christian Kaiser
Zugehörigkeit:
MPIM
Datum:
Mit, 2019-04-10 16:30 - Fre, 2019-07-12 18:00

## PLeaSANT (Participative learning seminar analytic number theory)

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Organiser(s):
Pieter Moree, Alisa Sedunova, Efthymios Sofos
Datum:
Mit, 2019-01-09 16:30 - Mit, 2020-01-08 17:30
Location:
MPIM Lecture Hall

## Seminar on Topological insulators

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Datum:
Mit, 2019-02-13 14:00 - 18:00

## Seminar on tilting characters of reductive groups

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Organiser(s):
Hankyung Ko
Datum:
Fre, 2019-02-08 15:00 - 18:00
Location:
MPIM Seminar Room

## Geometric recursion learning seminar

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Organiser(s):
Alessandro Giacchetto and Danilo Lewanski
Datum:
Mon, 2018-10-22 14:00 - Fre, 2019-12-20 15:00
Location:
MPIM Lecture Hall

### Content

Geometric Recursion (GR) is a fairly new technique that extends the usual Topological Recursion (TR) theory by means of Teichmüller theory, and relates to several results of Maryam Mirzakhani. It sits in the interplay between many areas of mathematics as mathematical physics, algebraic geometry and category theory.

The first part of the learning seminar aims to define and introduce GR. The second part of the seminar is more open and it will be tailored during the first weeks according to the taste of the participants towards open research questions.

## DyGIT Seminar: (Dynamics, Geometry and Interactions on Tuesdays)

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Organiser(s):
Polyxeni Spilioti, Francisco Javier Torres de Lizaur
Datum:
Fre, 2018-10-05 09:02 - Mon, 2019-09-30 10:02

## Seminar Geometry and Dynamics

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Organiser(s):
Polyxeni Spilioti and Francisco Javier Torres de Lizaur
Datum:
Die, 2018-09-25 16:30 - 17:30
Location:
MPIM Seminar Room

## Working group on Grothendieck-Teichmüller groups

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Organiser(s):
Noémie Combe
Datum:
Fre, 2018-09-21 14:00 - Fre, 2019-02-01 12:30
Location:
MPIM Seminar Room

The idea of this working group is to have an exchange of points of views
concerning a tool which connects both geometric and arithmetic areas.
People who do not necessarily want to give a talk, are also welcome.

## Learning seminar on deformation theory

Posted in
Organiser(s):
Christian Blohmann, Sylvain Lavau, Joao Nuno Mestre, Joost Nuiten
Datum:
Don, 2018-10-04 10:00 - Don, 2019-02-28 12:00
Location:
MPIM Seminar Room

The goal of the seminar is to rigorously understand the statement ''Every deformation problem in characteristic zero is controlled by a differential graded Lie algebra". This statement has long been a philosophy/guiding principle when studying deformations of algebraic or geometric structures. By the end of the seminar we aim to understand the statement and proof of its following modern incarnation:

Theorem (Lurie, Pridham)
There is an equivalence of $\infty$-categories between the $\infty$-category of formal moduli problems and the $\infty$-category of dgLa's over a field of characteristic zero.

Everyone is welcome, whether to give a talk or simply attend. If you think you'd like to give a talk please come to the first meeting or get in touch with one of the organizers.

#### Contents

In the first part we will see some deformation problems that naturally give rise to dgLa's, and that can also be encoded in deformation functors (also called formal moduli problems). We will see that the two are related by the Maurer-Cartan equation.

In the second part we will study how to construct a deformation functor out of a dgLa using the Maurer-Cartan equation. Conversely, we will build a dgLa out of a deformation functor. For that, we will need to understand some categorical properties of the $\infty$-category of dgLa's - roughly, that we can describe it in terms of generators and relations. This will be done making use of the Chevalley-Eilenberg complex of a dgLa, so that we can work in differential graded local Artinian rings (dgArt) instead.

In the third part we will see that the construction of a dgLa out of a deformation functor is an equivalence of $\infty$-categories between formal moduli problems and dgLa's. Finally, we will see that the inverse of this equivalence is given by the Maurer-Cartan construction.

#### Talks

1. Motivation and examples
2. Deformation Problems and Moduli Problems  (Notes by Alex)
3. Deformation functors - Modern approach and the MC equation (Notes by Joao)
4. The Chevalley-Eilenberg complex $C^*$, and how it is related to the Maurer-Cartan equation (Notes by Joost)
5. The model category dgLa
6. Koszul duality I - $C^*$ and its adjoint
7. Koszul duality II - $C^*$ is an equivalence (sometimes) (Notes by Sylvain)
8. Proof of the equivalence in the Main Theorem, part 1(Notes by Christian)
9. Proof of the equivalence in the Main Theorem, part 2 (Notes by David)
10. The inverse of the equivalence is given by Maurer-Cartan

#### References

On classical/motivating examples:

Historical:

## Master thesis seminar

Posted in
Datum:
Mit, 2018-07-25 14:00 - 15:30
Location:
MPIM Seminar Room
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