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Talks and seminars, possibly part of a conference or series.

PLeaSANT Problems

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Speaker: 
Date: 
Thu, 12/06/2025 - 16:30 - 17:30
Location: 
MPIM Lecture Hall

The participants are invited to share nice-looking (pleasant) questions in any number theory during this seminar.

Obstruction theory for the existence of 4-dimensional $\xi$-fillings of 3-manifolds

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Speaker: 
Simona Veselá
Affiliation: 
MPIM/Universität Bonn
Date: 
Tue, 10/06/2025 - 11:00 - 12:00
Location: 
MPIM Lecture Hall

By a result of Milnor we know that every spin 3-manifold spin bounds a 4-manifold. However, if we require this null-bordism to be of a prescribed normal 1-type, then it may no longer exist. In the spin case this normal $1$-type is a spin structure on the 3 manifold Y, together with the map on fundamental groups $\pi_1(Y) \to \pi_1(X)$ that we wish to realise via a bounding $4$-manifold $X$. We describe a three-stage geometric obstruction theory for the existence of a filling which extends this structure.

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Date: 
Fri, 15/08/2025 - 14:40 - 16:00
Location: 
MPIM Lecture Hall

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Date: 
Fri, 15/08/2025 - 11:55 - 13:00
Location: 
MPIM Lecture Hall

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Date: 
Fri, 15/08/2025 - 10:40 - 11:45
Location: 
MPIM Lecture Hall

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Date: 
Fri, 15/08/2025 - 09:00 - 10:05
Location: 
MPIM Lecture Hall

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Date: 
Thu, 14/08/2025 - 14:40 - 15:45
Location: 
MPIM Lecture Hall

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Date: 
Thu, 14/08/2025 - 11:55 - 13:00
Location: 
MPIM Lecture Hall

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Date: 
Thu, 14/08/2025 - 10:40 - 11:45
Location: 
MPIM Lecture Hall

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Date: 
Thu, 14/08/2025 - 09:00 - 10:05
Location: 
MPIM Lecture Hall

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Date: 
Wed, 13/08/2025 - 14:40 - 15:45
Location: 
MPIM Lecture Hall

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Date: 
Wed, 13/08/2025 - 11:55 - 13:00
Location: 
MPIM Lecture Hall

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Posted in
Date: 
Wed, 13/08/2025 - 10:40 - 11:45
Location: 
MPIM Lecture Hall

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Posted in
Date: 
Wed, 13/08/2025 - 09:00 - 10:05
Location: 
MPIM Lecture Hall

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Posted in
Date: 
Tue, 12/08/2025 - 14:40 - 15:45
Location: 
MPIM Lecture Hall

tba

Posted in
Date: 
Tue, 12/08/2025 - 11:55 - 13:00
Location: 
MPIM Lecture Hall

tba

Posted in
Date: 
Tue, 12/08/2025 - 10:40 - 11:45
Location: 
MPIM Lecture Hall

tba

Posted in
Date: 
Tue, 12/08/2025 - 09:00 - 10:05
Location: 
MPIM Lecture Hall

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Posted in
Date: 
Mon, 11/08/2025 - 14:40 - 15:45
Location: 
MPIM Lecture Hall

WIQI topology seminar

Posted in
Date: 
Fri, 13/06/2025 - 12:45 - 14:30
Location: 
MPIM Seminar Room
Parent event: 
WIQI topology seminar

Seminar webpage:  https://guests.mpim-bonn.mpg.de/bianchi/wiqi.html

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