Seminar Geometric Methods in Mathematics
Link: https://bbb1.physnet.uni-hamburg.de/rooms/sc7-avi-c5c-ez1/join
This is the website of the research seminar of Uli (Prof. Dr. Ulrich Krähmer) and his group. The talks usually cover topics such as homological algebra and category theory, noncommutative algebra and geometry, or Hopf algebras and their generalisations. The target audience consists of PhD and MSc students who write their thesis in one of these areas. Of course everyone is welcome, please contact us to be added to the email list if you want to join.
There will be a blend of external and internal speakers giving formal and informal talks, or we just read and discuss as a group, sometimes focussing for a few weeks on one topic. The only rule is that we meet each week in term time.
Unless otherwise indicated, the seminar takes place every Tuesday at 3:00 PM (CEST/CET). It is streamed on BigBlueButton: https://bbb.tu-dresden.de/b/ulr-ha4-xul-uoo. We will try to stream even the offline talks, so that people outside of Dresden will not miss out on anything.
In person talks will most likely happen in the room WIL B216.
Please register for the Mailing-List via: https://mailman.zih.tu-dresden.de/groups/listinfo/math-geometric-method
The speakers for the winter term 2025/2026 are:
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GMM Reading Group on ∞-Categories and ∞-Operads (website)
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Tuesday |
Marc Stephan (MPI-CBG Dresden and TU Dresden) An introduction to triangulated categories Triangulated categories provide a unifying language to do homological algebra. I will explain what they are, how they arise, what they are good for, and what they are less good for. |
| Tuesday 28.10.2025 online |
Marc Stephan (MPI-CBG Dresden and TU Dresden) Extending regular sequences to triangulated categories Regular sequences play a central role in commutative algebra controlling homological invariants. Triangulated categories provide a unifying framework for homological algebra, and in many important examples, they carry an action of a graded commutative ring, such as the group cohomology or Hochschild cohomology ring. In this talk, I will explain how to systematically define and study regular sequences in this general setting, extending results from commutative algebra. As applications, I will discuss generalizations of level inequalities due to Avramov, Buchweitz, Iyengar, and Miller, and strengthening of lower bounds for Rouquier dimension established by Bergh, Iyengar, Krause, and Oppermann. This is joint work with Antonia Kekkou and Janina Letz. |
The speakers for the summer term 2025 were:
| 15.04.2025 | Andrew Baker |
| 22.04.2025 | Ulrich Krähmer |
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13.05.2025 |
Marcelo Aguiar |
| 19.05.2025 + 20.05.2025 |
Symposion on Higher Structures for Hopf Algebras (website)
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| 20.05.2025 | Nir Gadish |
| 03.06.2025 and 17.06.2025 |
Zbigniew Wojciechowski |
| 01.07.2025 |
Ulrich Krähmer |
| 15.07.2025 |
Ulrich Krähmer |
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19.08.2025 |
Florian Warg |
| 17.09.2025 |
Janis Winter |
The speakers for the winter term 2024/25 were:
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21.10.2024 |
Guy Boyde |
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| 28.10.2024 |
Sarah Brauner |
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| 07.11.2024 |
Réamonn Ó Buachalla |
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| 11.11.2024 |
Hans-Christian Herbig |
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| 13.11.2024 | Jonathan Lindell | |
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18.11.2024 |
Jonas Nehme |
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| 25.11.2024 | Patricia Commins | |
| 02.12.2024 | Ivan Bartulović | |
| 13.12.2024 | Severin Barmeier | |
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16.12.2024 |
Johannes Flake | |
| 06.01.2025 |
Ulrich Krähmer |
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| 13.01.2025 | Sylvie Paycha | |
| 20.01.2025 |
Kelly Maggs |
The speakers for the summer term 2024 were:
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08.04.2024 |
Christian Lomp |
| 15.04.2024 |
Ayelet Lindenstrauss |
| 22.04.2024 |
Zbigniew Wojciechowski |
| 29.04.2024 |
Boris Shoikhet |
| 06.05.2024 |
Adam Rennie |
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27.05.2024 |
Andre Henriques |
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03.06.2024 |
Niels Kowalzig |
| 10.06.2024 |
Liao Wang |
| 17.06.2024 |
Jean-Simon Pacaud Lemay |
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24.06.2024 |
Justin Barthite |
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01.07.2024 |
Sean Sanford |
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08.07.2024 |
Mateusz Stroinski |
| 16.07.2024 | Ken Brown |
| 27.08.2024 |
Julius Benner |
The speakers for the winter term 2023/24 were:
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16.10.2023 |
Benjamin Haïoun |
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18.10.2023 |
John Boiquaye |
| 06.11.2023 |
Oliver Sander |
| 13.11.2023 |
Pedro Tamaroff |
| 20.11.2023 |
Marco De Renzi |
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11.12.2023 |
Cole Comfort |
| 18.12.2023 | Ehud Meir |
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08.01.2024 |
Adriana Balan |
| 15.01.2024 |
Daniel Gromada |
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22.01.2024 |
Anna Rodriguez Rasmussen |
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29.01.2024 |
Manuel Bodirsky |
The speakers for the summer term 2023 were:
| Date | Speaker |
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31.08.2023 |
Josefin Bernhard |
| 10.07.2023 |
Mateusz Stroinski |
| 03.07.2023 |
Daniel Graves |
| 26.06.2023 |
Anna-Katharina Hirmer |
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19.06.2023 |
Eamon Quinlan-Gallego |
| 12.06.2023 |
Ján Pulmann |
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05.06.2023 |
Nima Rasekh |
| 15.05.2023 | Estanislao Herscovich |
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08.05.2023 |
Ben Elias |
| 24.04.2023 |
Andrew Baker |
| 17.04.2023 | Friedrich Wagemann |
The speakers for the winter term 2022/23 were:
| Date | Speaker |
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17.10.2022 |
Daniel Tubbenhauer |
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24.10.2022 |
Richard Garner |
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07.11.2022 |
John Bourke |
| 14.11.2022 | Julian Holstein |
| 15.11.2022 |
Chris Heunen |
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21.11.2022 |
Misha Feigin |
| 28.11.2022 | Joanna Meinel |
| 05.12.2022 |
Andrea Gagna |
| 12.12.2022 | Vanessa Miemietz |
| 19.12.2022 |
George Balla |
| 16.01.2023 |
Tony Zorman |
| 23.01.2023 |
Zbigniew Wojciechowski |
| 30.01.2023 | Ulrich Krähmer |
The speakers for the summer term 2022 were:
| Date |
Speaker |
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04.04.2022 11.04.2022 25.04.2022 02.05.2022 09.05.2022 16.05.2022 23.05.2022 30.05.2022 02.06.2022 13.06.2022 20.06.2022 27.06.2022 04.07.2022 11.07.2022 08.08.2022 22.08.2022 |
Robert Laugwitz Gregory Ginot Janez Mrcun Catherine Meussburger Ben Ward Michael Batanin Muriel Livernet Pierre-Louis Curien Ivan Bartulović Bojana Femic Natalia Iyudu Ralph Kaufmann Fosco Loregian Ieke Moerdijk Noemi Combe Hans-Christian Herbig |
The speakers for the winter term 2021/22 were:
| Date |
Speaker |
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04.10.2021 11.10.2021 18.10.2021 25.10.2021 01.11.2021 08.11.2021 15.11.2021 22.11.2021 29.11.2021 06.12.2021 13.12.2021 20.12.2021 10.01.2022 24.01.2022 31.01.2022 |
Martin Markl Lukas Woike Sebastian Halbig Myriam Mahaman Aryan Ghobadi Laiachi El-Kaoutit Jeff Giansiracusa Jens Kaad Bruce Bartlett Chelsea Walton Michael Cuntz Shahn Majid Tony Zorman Stephanie Feilitzsch (Viva) Myriam Mahaman |
The speakers for the summer term 2021 were:
| Date |
Speaker |
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19.04.2021 26.04.2021 03.05.2021 10.05.2021 17.05.2021 31.05.2021 07.06.2021 14.06.2021 21.06.2021 28.06.2021 05.07.2021 12.07.2021 26.07.2021 |
Christian Korff Cigdem Yirtici internal presentations Manuel Martins Nicolas Garrel Ingo Runkel Azat Gainutdinov Yorck Sommerhäuser Claudia Scheimbauer Paolo Saracco Tom Leinster Martin Hyland Tony Zorman |
The speakers for the winter term 2020/21 were:
| Date |
Speaker |
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26.10.2020 02.11.2020 09.11.2020 16.11.2020 23.11.2020 30.11.2020 07.12.2020 14.12.2020 11.01.2021 18.01.2021 25.01.2021 01.02.2021 08.02.2021 15.02.2021 |
Atabey Kaygun Lucia Rotheray Sebastian Halbig Matthias Valvekens Friedrich Wagemann Stephanie Feilitzsch David Jordan Tomasz Brzezinski Anna Kula Ilya Shaprio Yuri Berest Blessing Oni John Boiquaye Ivan Angiono |