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MPI-Oberseminar

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Organiser(s): 
C. Kaiser
Date: 
Thu, 31/01/2013 - 15:00 - Thu, 31/12/2026 - 16:00
Location: 
MPIM Lecture Hall
Details: 
Program and Abstracts of MPI-Oberseminar

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
Details: 
Program and Abstracts of Friedrich Hirzebruch Lecture

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.

Conference on "New Perspectives on Stable Homotopy and Beyond"

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Organiser(s): 
Tobias Barthel, James Cranch, Luca Pol, Sarah Whitehouse
Date: 
Mon, 07/09/2026 - 09:00 - Fri, 11/09/2026 - 12:30
Location: 
MPIM Lecture Hall
Details: 
Program and Abstracts of Conference on "New Perspectives on Stable Homotopy and Beyond"

Conference on "New Perspectives on Stable Homotopy and Beyond", September 7-11, 2026

The goal of this conference is to bring together researchers working in and around stable and chromatic homotopy theory, higher categories, and their geometric counterparts. It will serve both to highlight recent advances in these fields and to celebrate the fundamental contributions of Neil Strickland to their development.

tba

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Speaker: 
Igor Shparlinski
Affiliation: 
University of New South Wales
Date: 
Wed, 26/08/2026 - 14:30 - 15:30
Location: 
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

tba

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Speaker: 
William Banks
Affiliation: 
University of Missouri
Date: 
Wed, 19/08/2026 - 14:30 - 15:30
Location: 
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

Freely adding adjoints to (∞,n)-categories and the walking adjunction

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Speaker: 
Fernando Abellán
Affiliation: 
MPIM
Date: 
Thu, 13/08/2026 - 15:00 - 16:00
Location: 
MPIM Lecture Hall
Parent event: 
MPI-Oberseminar

The goal of this talk is to give a gentle introduction to adjunctions in the higher-categorical setting. After reviewing the main definitions, we will explain how to freely adjoin adjoints to an (∞,n)-category.
Time permitting, we will show how this construction can be used to recover a result of Riehl and Verity with a model-independent proof.

The linear relations among radicals

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Speaker: 
Antonella Perucca
Affiliation: 
University of Luxembourg
Date: 
Wed, 12/08/2026 - 14:30 - 15:30
Location: 
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

Given a base field $K$, we consider its radicals, namely the elements $\alpha$ (in a given algebraic closure of $K$) such that $\alpha^n\in K$ for some integer $n$ coprime to the characteristic of $K$. The most classical case is covered by Kummer theory, which additionally requires that the $n$-th roots of unity are contained in $K$. We study the entanglement of radicals, namely their $K$-linear relations that do not stem from multiplicative relations.

The Romanov and Linnik-Goldbach problems

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Speaker: 
Daniel Johnston
Affiliation: 
MPIM
Date: 
Tue, 11/08/2026 - 14:00 - 15:00
Location: 
MPIM Lecture Hall
Parent event: 
PLeaSANT

In this talk, we will explore two famous problems in number theory closely related to Goldbach's conjecture. The first, Romanov's problem, asks how many odd integers can be represented as the sum of a prime and a power of two. The second, the Goldbach-Linnik problem, is related to representations of even integers as the sum of two primes and a bounded number of powers of two. The content of this talk is closely related to a review recently written by myself and Tim Trudgian in honour of Roger Heath-Brown's 75th birthday.

Defects in Skein Theory & TQFT

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Speaker: 
Patrick Kinnear
Affiliation: 
Universität Hamburg
Date: 
Tue, 11/08/2026 - 14:00 - 15:00
Location: 
MPIM Seminar Room
Parent event: 
Quantum topology seminar

Higher Hopf algebras

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Speaker: 
Ralph Kaufmann
Affiliation: 
Purdue/z. Z. MPIM
Date: 
Tue, 11/08/2026 - 11:00 - 12:30
Location: 
MPIM Seminar Room
Parent event: 
Abstract Homotopy Theory Seminar

Together with Galvez-Carilllo and Tonks we established that every simplicial set yields a bi-algebra, whose cubical structure can be understood via the category of simplicial strings, aka. necklaces, using Joyal duality. The reason for the existence is the fact that simplices form an operad and after dualization give a co-operad with multiplication which is the correct input for the GCKT machine.

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