SFB1085 - Higher Invariants - User contributions [en]

A generalisation of Day convolution for operad-like structures

2026-01-16T13:24:48Z

Ghd08439: Created page with "A fundamental construction in higher algebra is that of Day convolution. This construction, if it exists, defines an internal hom-object in the ∞-category of ∞-operads. In this talk, I will describe an explicit condition for the existence of such internal hom-objects for other operad-like structures. Even in the case of ∞-operads, our proof is very different from previous constructions. The existence condition we obtain is very similar to the Conduché criterion fo..."

A fundamental construction in higher algebra is that of Day convolution. This construction, if it exists, defines an internal hom-object in the ∞-category of ∞-operads. In this talk, I will describe an explicit condition for the existence of such internal hom-objects for other operad-like structures. Even in the case of ∞-operads, our proof is very different from previous constructions. The existence condition we obtain is very similar to the Conduché criterion for detecting exponentiable functors between ∞-categories, and in many examples it is both a sufficient and necessary condition.

If time permits, I will describe how this construction can be used to prove a new universal property of span categories.

This is joint work with Félix Loubaton and Jaco Ruit.

AG-Seminar WS2021/22:

2026-01-16T13:23:23Z

Ghd08439:

'''AG Seminar'''

'''Description:''' The aim of the Seminar is to present and discuss recent results in research areas from Homotopy Theory and K-theory to Global Analysis.

'''Time and place:''' Thursday 12-14, SFB Lecture Hall.

'''Zoom Link:''' https://uni-regensburg.zoom.us/j/7601042838?pwd=bUVEaHhuY01abmo4T3Fza1NZMEVNUT09

'''Sommersemester 2026'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|16.4.2026
|
|
|-
|2
|23.4.2026
|
|
|-
|3
|30.4.2026
|
|
|-
|4
|7.5.2026
|
|
|-
|5
|14.5.2026
| Holiday
|
|-
|6
|21.5.2026
|
|
|-
|7
|28.5.2026
|
|
|-
|8
|4.6.2026
| Holiday
|
|-
|9
|11.6.2026
|
|
|-
|10
|18.6.2026
| TBA
| Jens Eberhardt (Mainz)
|-
|11
|25.6.2026
|
|
|-
|12
|2.7.2026
|
|
|-
|13
|9.7.2026
|
|
|-
|14
|16.7.2026
|
|
|}

<hr><hr>

'''Wintersemester 2025/26'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|16.10.2025
|
|
|-
|2
|23.10.2025
| DGAs with polynomial homology and applications
| Markus Land
|-
|3
|30.10.2025
|
|
|-
|4
|6.11.2025
| [[Duality for K-theory in motivic homotopy theory]]
| Jeroen Hekking
|-
|5
|13.11.2025
| '''talk Cancelled'''
|
|-
|6
|20.11.2025
| [[On Verdier Duality]]
| Georg Lehner (Universität Münster)
|-
|7
|27.11.2025
| [[Nori motivic sheaves as sheaves of Nori motives]]
| Luca Terenzi
|-
|8
|4.12.2025
| [[The cobordism spectrum of Poincare spaces]]
| Kaif Hilman
|-
|9
|11.12.2025
| What is an ∞-Category?
| Nima Rasekh (Universität Greifswald)
|-
|10
|18.12.2025
| [[Grothendieck-Witt theory of pushouts]]
| Andreas Huber (Universität Augsburg)
|-
|11
|8.1.2026
|
|
|-
|12
|15.1.2026
| [[Semifree isovariant Poincaré spaces and the gap condition]]
| Dominik Kirstein (LMU München)
|-
|13
|22.1.2026
| [[A generalisation of Day convolution for operad-like structures]]
| Thomas Blom (MPIM Bonn)
|-
|14
|29.1.2026
| TBA
| Oliver Bräunling (FH Dortmund)
|-
|15
|5.2.2026
| TBA
| Fernando Abellan
|}

<hr><hr>

'''Sommersemester 2025'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|24.4.2025
|Manifolds and analytic stacks
|J. Mann (Bonn)
|-
|2
|1.5.2025
|Holiday
|
|-
|3
|8.5.2025
| Effectivity of generalized double categories
| Félix Loubaton
|-
|4
|15.5.2025
|The tt-Spectrum of Integral Permutation Modules
| Juan Omar Gomez (Bielefeld)
|-
|5
|22.5.2025
|Constructible sheaves on toric varieties
|Remy van Dobben de Bruyn
|-
|6
|29.5.2025
|Holiday
|
|-
|7
|5.6.2025
|
|
|-
|8
|12.6.2025
| The real Betti realization of motivic Thom spectra and of very effective Hermitian K-theory
| Julie Bannwart
|-
|9
|19.6.2025
| Holiday
|
|-
|10
|26.6.2025
| [[The root functor]]
| Francesca Pratali
|-
|11
|3.7.2025
| Some remarks on exact categories and their K-theory
| Christoph Winges
|-
|12
|10.7.2025
| [[Unfolding of symmetric monoidal (∞,n)-categories]]
| Rune Haugseng
|-
|13
|17.7.2025
| On the categorification of homology
| Hadrian Heine
|-
|14
|24.7.2025
| tba
| Can Yaylali
|}

<hr><hr>

'''Wintersemester 24/25'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|17.10.2024
|[[(∞,2)-Topoi and descent]]
|Fernando Abellan Garcia (NTNU)
|-
|2
|24.10.2024
|
|
|-
|3
|31.10.2024
|The geometric diagonal of the special linear algebraic cobordism
|Egor Zolotarev (LMU)
|-
|4
|07.11.2024
|[[Purity for Algebraic Stacks]]
|Alessandro D'Angelo (KTH)
|-
|5
|14.11.2024
|
|
|-
|6
|21.11.2024
|Equivariant aspects of Hochschild homology
|Zhouhang Mao (Univ. Amsterdam)
|-
|7
|28.11.2024
|[[Proof of the Deligne-Milnor conjecture]]
|Massimo Pippi (Univ. Angers)
|-
|8
|05.12.2024
|[[Classification of n-connective (2n-2)-truncated spaces]]
|Daniel Exposito (Univ. Copenhagen)
|-
|9
|12.12.2024
|[[K-theory for analytic spaces]]
|Devarshi Mukherjee
|-
|10
|19.12.2024
|
|
|-
|11
|09.01.2025
|Grothendieck-Witt theory of derived schemes
|Marc Hoyois
|-
|12
|16.01.2025
|
|
|-
|13
|23.01.2025
|Model-Independent Lax Functors
|Johannes Gloßner
|-
|14
|30.01.2025
|[[Higher enhancements of mixed Hodge modules]]
|Swann Tubach (ENS Lyon)
|-
|15
|06.02.2025
|[[Limits of (∞, 1)-categories with Structure & Their Lax Morphisms]]
|Joanna Ko (Masaryk University)
|}

<hr><hr>

'''SOMMER Semester 2024'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|18.4.2024
|
|
|-
|2
|25.04.2024
| A Functorial Rectification of Finitely Cocomplete ∞-Categories
| Benni Ngo
|-
|3
|02.05.2024
| Perverse sheaves and weak Lefschetz theorems
| Denis-Charles Cisinski
|-
|4
|09.05.2024
| No Seminar (Christi Himmelfahrt)
|
|-
|5
|16.05.2024
| this week, the whole seminar moves to Greifswald
|
|-
|6
|23.05.2024
| Grothendieck construction and representation theorem for lax double presheaves
| Benedikt Fröhlich
|-
|7
|30.05.2024
| No seminar (Corpus Christi)
|
|-
|8
|06.06.2024
|[[Étale motives of geometric origin]]
| Raphaël Ruimy (Milan)
|-
|9
|13.06.2024
|[[A general Greenlees-Mays splitting principle]]
|Ivo Dell'Ambrogio (Lille)
|-
|10
|20.06.2024
|[[Categorical Künneth formulas]]
|Timo Richarz (TU Darmstadt)
|-
|11
|27.06.2024
|Conference
|
|-
|12
|04.07.2024
|[[The tempered dual of reductive symmetric spaces, C*-algebras, and K-theory]]
|Shintaro Nishikawa (Southampton)
|-
|13
|11.07.2024
|N.N
|Pelle Steffens (Munich)
|-
|14
|18.07.2024
| [[Animated λ-rings and Frobenius lifts]]
| Edith Hübner (Münster)
|-
|}

<hr><hr>

'''Winter Semester 2023/24'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|19.10.2023
|[[On the motivic Adams conjecture]]
|Alexey Ananyevskiy
|-
|2
|26.10.2023
|[[Dualizable categories and E-Theory]]
|Benjamin Dünzinger/Ulrich Bunke
|-
|3
|02.11.2023
|[[Dualizable categories and E-Theory-II]]
|Benjamin Dünzinger/Ulrich Bunke
|-
|4
|09.11.2023
|[[A pro-cdh topology and motivic cohomology of schemes]]
|Shuji Saito
|-
|5
|16.11.2023
|Cohomological invariants of quadrics via Morava motives
|Pavel Sechin
|-
|6
|23.11.2023
|Formal category theory within ∞-categorical proarrow equipments
|Jaco Ruit
|-
|7
|30.11.2023
|
|
|-
|8
|07.12.2023
|[[Motivic cohomology of mixed characteristic schemes]]
|Tess Bouis
|-
|9
|14.12.2023
|[[Six-functor formalisms are compactly supported]]
|Josefien Kuijper
|-
|10
|21.12.2023
|Towards a pro-étale homotopy type of schemes
| Sebastian wolf
|-
|11
|11.01.2024
|
|
|-
|12
|18.01.2024
|Gabber's presentation lemma over a general base
|Suraj Yadav
|-
|13
|25.01.2024
|[[Chow-Lefschetz motives]]
|Bruno Kahn
|-
|14
|01.02.2024
|[[Topological Modular Forms and supersymmetric quantum field theories]]
|Mayuko Yamashita
|-
|15
|08.02.2024
|[[Group completion of E_n-spaces and infinite products]]
|Georg Lehner (FU Berlin)
|-
|}

<hr><hr>

'''Summer Semester 2023'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|20.04.2023
|
|
|-
|2
|27.04.2023 '''12:30'''
|Universality and Examples in the Context of Functorial Semi-Norms (PhD defense)
|Johannes Witzig
|-
|3
|04.05.2023
|No seminar
|
|-
|4
|11.05.2023
|tba
|Hoang Kim Nguyen
|-
|5
|18.05.2023
|No seminar (holiday)
|
|-
|6
|25.05.2023
|[[Separability in homotopical algebra]]
|Maxime Ramzi (Copenhagen)
|-
|7
|01.06.2023
|[[Blow-ups and normal bundles in nonconnective derived geometry]]
|Jeroen Hekking
|-
|8
|08.06.2023
|No seminar (holiday)
|
|-
|9
|15.06.2023
|The theorem of the heart
|Giacomo Bertizzolo
|-
|10
|22.06.2023
|[[Shapes and locally constant sheaves]]
| Marc Hoyois
|-
|11
|29.06.2023
|Norms and Transfers in Motivic Homotopy Theory
|Brian Shin
|-
|12
|06.07.2023
|[[On the category of localizing motives]]
|Alexander Efimov
|-
|13
|13.07.2023
|Twisted ambidexterity in equivariant homotopy theory
|Bastiaan Cnossen
|-
|14
|20.07.2023
| (reserved)
|
|-
|}

<hr> <hr>

'''Winter Semester 22/23'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|20.10.2022
|Model categories for o-minimal geometry
|Reid Barton (Univ. Freiburg)
|-
|2
|27.10.2022
|
|
|-
|3
|03.11.2022 '''[online]'''
|The reductive Borel-Serre compactification as a model for unstable algebraic K-theory
|Mikala Ørsnes Jansen (Copenhagen)
|-
| 4
|10.11.2022
| [[Traces and categorification]]
| Bastiaan Cnossen (Bonn)
|-
|5
|17.11.2022
|no seminar
|
|-
|6
|24.11.2022
| [[Cut and paste invariants of manifolds via K-theory]]
| Julia Semikina (Münster)
|-
|7
|01.12.2022
|Discussion on Duality and Transfer I: Becker-Gottlieb transfer, Atiyah-Duality and A-theory transfer
|Bunke/Winges/Raptis
|-
|8
|08.12.2022
|Discussion on Duality and Transfer II: Fibrewise duality and transfer, functoriality
|N.N
|-
|9
|15.12.2022
|[[Unipotent homotopy theory of schemes]]
|Shubhodip Mondal (MPIM Bonn)
|-
|10
|22.12.2023
|[[The stable cohomology of symplectic groups of the integers]]
|Fabian Hebestreit (Aberdeen)
|-
|11
|12.01.2023
|[[The logic of étale maps]]
|Mathieu Anel (Carnegie Mellon University)
|-
|12
|19.01.2023
|[[Decoupling Moduli of Configurations Spaces on Surfaces]]
|Luciana Basualdo Bonatto (MPIM Bonn)
|-
|13
|26.01.2023
|The K_2-analogue of Bass-Quillen conjecture and A1-fundamental groups of Chevalley groups.
|Sergey Sinchuk (Munich, JetBrains GmbH)
|-
|14
|02.02.2023
|Genuine equivariant hermitian K-theory for finite groups
|Kaif Hilman (MPIM Bonn)
|-
|15
|09.02.2023
| Proper morphisms of infinity topoi
| Louis Martini (NTNU Trondheim)
|}

<hr><hr>

'''Summer Semester 2022'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|28.04.2022
| Devissage in algebraic K-theory (0)
| George Raptis
|-
|2
|05.05.2022
| Devissage in algebraic K-theory (1)
| Marco Volpe
|-
|3
|12.05.2022
|
|
|-
| 4
| 19.05.2022 '''[online]'''
| [[Universal cohomology theories]]
| Luca Barbieri Viale (Milan)
|-
|5
|26.05.2022
| Christi-Himmelfahrt
| -
|-
|6
| 02.06.2022
| [[Cdh motivic cohomology via prisms]]
| E. Elmanto (Harvard)
|-
|7
| 09.06.2022 '''[online]'''
| [[Exponential periods and o-minimality]]
| Johan Commelin (Freiburg)
|-
|8
| 16.06.2022
| Fronleichnam
| -
|-
|9
| 23.06.2022
| [[Excisive Approximation of l^1-Homology]]
| J. Witzig (Regensburg)
|-
|10
| 30.06.2022
|
|
|-
|11
| 07.07.2022
| Posets for which Verdier duality holds
| Ko Aoki (MPIM Bonn)
|-
|12
| 14.07.2022
| [[Synthetic (∞,1)-category theory in simplicial homotopy type theory]]
| Jonathan Weinberger (Johns Hopkins University)
|-
|13
| 21.07.2022
| Artin motivic tensor-triangular geometry
| Martin Gallauer (MPIM Bonn)
|-
|14
| 28.07.2022
| X. Bavarian Geometry & Topology Meeting
| (Augsburg)
|}

<hr><hr>

'''Winter Semester 2021/22'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|21.10.2021
| Derived microlocal sheaf theory
| Adeel Khan (Academia Sinica)
|-
|2
|28.10.2021
|
|
|-
|3
|4.11.2021
| Bounded cohomology and homotopy colimits
| George Raptis
|-
| 4
| 11.11.2021
| [[Filter Quotient ∞-Categories]]
| Nima Rasekh (EPFL)
|-
|5
|18.11.2021
| *****
| SFB Meeting in Windberg
|-
|6
| 25.11.2021
| [[Quadratic enrichments of enumerative counts using Atiyah-Bott localization]]
| Sabrina Pauli (Duisburg-Essen)
|-
|7
| 2.12.2021
| [[The Chow t-structure on the ∞-category of motivic spectra]]
| Tom Bachmann (LMU)
|-
|8
| 9.12.2021
| G-global homotopy theory and algebraic K-theory
| Tobias Lenz (Bonn)
|-
|9
| 16.12.2021
| *****
| [http://frenck.net/Math/BGTM/ 9th Bavarian Geometry & Topology Meeting]
|-
|10
| 13.1.2022
| [[cancelled]]
|
|-
|11
| 20.1.2022
| [[Topological Fukaya categories of symmetric powers]]
| Tobias Dyckerhoff (Hamburg)
|-
|12
| 27.1.2022
| [[Unstraightening for Segal spaces]]
| Joost Nuiten (Toulouse)
|-
|13
| 3.2.2022
| [[Polynomial monads, Grothendieck homotopy theory and delooping of spaces of long knots]]
| Michael Batanin (Prague)
|-
|14
| 10.2.2022
| [[Homotopy links and stratified homotopy theories]]
| Sylvain Douteau (Stockholm)
|}

A generalisation of Day convolution for Operad-like structures

2026-01-16T13:22:16Z

Ghd08439: Created page with "A fundamental construction in higher algebra is that of Day convolution. This construction, if it exists, defines an internal hom-object in the oo-category of oo-operads. In this talk, I will describe an explicit condition for the existence of such internal hom-objects for other operad-like structures. Even in the case of oo-operads, our proof is very different from previous constructions. The existence condition we obtain is very similar to the Conduché criterion for d..."

A fundamental construction in higher algebra is that of Day convolution. This construction, if it exists, defines an internal hom-object in the oo-category of oo-operads. In this talk, I will describe an explicit condition for the existence of such internal hom-objects for other operad-like structures. Even in the case of oo-operads, our proof is very different from previous constructions. The existence condition we obtain is very similar to the Conduché criterion for detecting exponentiable functors between oo-categories, and in many examples it is both a necessary and sufficient condition.
If time permits, I will describe how this construction can be used to prove a new universal property of span categories.

This is joint work with Félix Loubaton and Jaco Ruit.

AG-Seminar WS2021/22:

2025-11-13T18:28:08Z

Ghd08439:

'''AG Seminar'''

'''Description:''' The aim of the Seminar is to present and discuss recent results in research areas from Homotopy Theory and K-theory to Global Analysis.

'''Time and place:''' Thursday 12-14, SFB Lecture Hall.

'''Zoom Link:''' https://uni-regensburg.zoom.us/j/7601042838?pwd=bUVEaHhuY01abmo4T3Fza1NZMEVNUT09

'''Wintersemester 2025/26'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|16.10.2025
|
|
|-
|2
|23.10.2025
| DGAs with polynomial homology and applications
| Markus Land
|-
|3
|30.10.2025
|
|
|-
|4
|6.11.2025
| [[Duality for K-theory in motivic homotopy theory]]
| Jeroen Hekking
|-
|5
|13.11.2025
| '''talk Cancelled'''
|
|-
|6
|20.11.2025
| [[On Verdier Duality]]
| Georg Lehner (Universität Münster)
|-
|7
|27.11.2025
| [[Nori motivic sheaves as sheaves of Nori motives]]
| Luca Terenzi
|-
|8
|4.12.2025
| TBA
| Kaif Hilman
|-
|9
|11.12.2025
| TBA
| Nima Rasekh (Universität Greifswald)
|-
|10
|18.12.2025
| TBA
| Andreas Huber (Universität Augsburg)
|-
|11
|8.1.2026
|
|
|-
|12
|15.1.2026
|
|
|-
|13
|22.1.2026
| TBA
| Thomas Blom (MPIM Bonn)
|-
|14
|29.1.2026
| TBA
| Oliver Bräunling (FH Dortmund)
|-
|15
|5.2.2026
| TBA
| Francesca Pratali (Utrecht University)
|}

<hr><hr>

'''Sommersemester 2025'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|24.4.2025
|Manifolds and analytic stacks
|J. Mann (Bonn)
|-
|2
|1.5.2025
|Holiday
|
|-
|3
|8.5.2025
| Effectivity of generalized double categories
| Félix Loubaton
|-
|4
|15.5.2025
|The tt-Spectrum of Integral Permutation Modules
| Juan Omar Gomez (Bielefeld)
|-
|5
|22.5.2025
|Constructible sheaves on toric varieties
|Remy van Dobben de Bruyn
|-
|6
|29.5.2025
|Holiday
|
|-
|7
|5.6.2025
|
|
|-
|8
|12.6.2025
| The real Betti realization of motivic Thom spectra and of very effective Hermitian K-theory
| Julie Bannwart
|-
|9
|19.6.2025
| Holiday
|
|-
|10
|26.6.2025
| [[The root functor]]
| Francesca Pratali
|-
|11
|3.7.2025
| Some remarks on exact categories and their K-theory
| Christoph Winges
|-
|12
|10.7.2025
| [[Unfolding of symmetric monoidal (∞,n)-categories]]
| Rune Haugseng
|-
|13
|17.7.2025
| On the categorification of homology
| Hadrian Heine
|-
|14
|24.7.2025
| tba
| Can Yaylali
|}

<hr><hr>

'''Wintersemester 24/25'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|17.10.2024
|[[(∞,2)-Topoi and descent]]
|Fernando Abellan Garcia (NTNU)
|-
|2
|24.10.2024
|
|
|-
|3
|31.10.2024
|The geometric diagonal of the special linear algebraic cobordism
|Egor Zolotarev (LMU)
|-
|4
|07.11.2024
|[[Purity for Algebraic Stacks]]
|Alessandro D'Angelo (KTH)
|-
|5
|14.11.2024
|
|
|-
|6
|21.11.2024
|Equivariant aspects of Hochschild homology
|Zhouhang Mao (Univ. Amsterdam)
|-
|7
|28.11.2024
|[[Proof of the Deligne-Milnor conjecture]]
|Massimo Pippi (Univ. Angers)
|-
|8
|05.12.2024
|[[Classification of n-connective (2n-2)-truncated spaces]]
|Daniel Exposito (Univ. Copenhagen)
|-
|9
|12.12.2024
|[[K-theory for analytic spaces]]
|Devarshi Mukherjee
|-
|10
|19.12.2024
|
|
|-
|11
|09.01.2025
|Grothendieck-Witt theory of derived schemes
|Marc Hoyois
|-
|12
|16.01.2025
|
|
|-
|13
|23.01.2025
|Model-Independent Lax Functors
|Johannes Gloßner
|-
|14
|30.01.2025
|[[Higher enhancements of mixed Hodge modules]]
|Swann Tubach (ENS Lyon)
|-
|15
|06.02.2025
|[[Limits of (∞, 1)-categories with Structure & Their Lax Morphisms]]
|Joanna Ko (Masaryk University)
|}

<hr><hr>

'''SOMMER Semester 2024'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|18.4.2024
|
|
|-
|2
|25.04.2024
| A Functorial Rectification of Finitely Cocomplete ∞-Categories
| Benni Ngo
|-
|3
|02.05.2024
| Perverse sheaves and weak Lefschetz theorems
| Denis-Charles Cisinski
|-
|4
|09.05.2024
| No Seminar (Christi Himmelfahrt)
|
|-
|5
|16.05.2024
| this week, the whole seminar moves to Greifswald
|
|-
|6
|23.05.2024
| Grothendieck construction and representation theorem for lax double presheaves
| Benedikt Fröhlich
|-
|7
|30.05.2024
| No seminar (Corpus Christi)
|
|-
|8
|06.06.2024
|[[Étale motives of geometric origin]]
| Raphaël Ruimy (Milan)
|-
|9
|13.06.2024
|[[A general Greenlees-Mays splitting principle]]
|Ivo Dell'Ambrogio (Lille)
|-
|10
|20.06.2024
|[[Categorical Künneth formulas]]
|Timo Richarz (TU Darmstadt)
|-
|11
|27.06.2024
|Conference
|
|-
|12
|04.07.2024
|[[The tempered dual of reductive symmetric spaces, C*-algebras, and K-theory]]
|Shintaro Nishikawa (Southampton)
|-
|13
|11.07.2024
|N.N
|Pelle Steffens (Munich)
|-
|14
|18.07.2024
| [[Animated λ-rings and Frobenius lifts]]
| Edith Hübner (Münster)
|-
|}

<hr><hr>

'''Winter Semester 2023/24'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|19.10.2023
|[[On the motivic Adams conjecture]]
|Alexey Ananyevskiy
|-
|2
|26.10.2023
|[[Dualizable categories and E-Theory]]
|Benjamin Dünzinger/Ulrich Bunke
|-
|3
|02.11.2023
|[[Dualizable categories and E-Theory-II]]
|Benjamin Dünzinger/Ulrich Bunke
|-
|4
|09.11.2023
|[[A pro-cdh topology and motivic cohomology of schemes]]
|Shuji Saito
|-
|5
|16.11.2023
|Cohomological invariants of quadrics via Morava motives
|Pavel Sechin
|-
|6
|23.11.2023
|Formal category theory within ∞-categorical proarrow equipments
|Jaco Ruit
|-
|7
|30.11.2023
|
|
|-
|8
|07.12.2023
|[[Motivic cohomology of mixed characteristic schemes]]
|Tess Bouis
|-
|9
|14.12.2023
|[[Six-functor formalisms are compactly supported]]
|Josefien Kuijper
|-
|10
|21.12.2023
|Towards a pro-étale homotopy type of schemes
| Sebastian wolf
|-
|11
|11.01.2024
|
|
|-
|12
|18.01.2024
|Gabber's presentation lemma over a general base
|Suraj Yadav
|-
|13
|25.01.2024
|[[Chow-Lefschetz motives]]
|Bruno Kahn
|-
|14
|01.02.2024
|[[Topological Modular Forms and supersymmetric quantum field theories]]
|Mayuko Yamashita
|-
|15
|08.02.2024
|[[Group completion of E_n-spaces and infinite products]]
|Georg Lehner (FU Berlin)
|-
|}

<hr><hr>

'''Summer Semester 2023'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|20.04.2023
|
|
|-
|2
|27.04.2023 '''12:30'''
|Universality and Examples in the Context of Functorial Semi-Norms (PhD defense)
|Johannes Witzig
|-
|3
|04.05.2023
|No seminar
|
|-
|4
|11.05.2023
|tba
|Hoang Kim Nguyen
|-
|5
|18.05.2023
|No seminar (holiday)
|
|-
|6
|25.05.2023
|[[Separability in homotopical algebra]]
|Maxime Ramzi (Copenhagen)
|-
|7
|01.06.2023
|[[Blow-ups and normal bundles in nonconnective derived geometry]]
|Jeroen Hekking
|-
|8
|08.06.2023
|No seminar (holiday)
|
|-
|9
|15.06.2023
|The theorem of the heart
|Giacomo Bertizzolo
|-
|10
|22.06.2023
|[[Shapes and locally constant sheaves]]
| Marc Hoyois
|-
|11
|29.06.2023
|Norms and Transfers in Motivic Homotopy Theory
|Brian Shin
|-
|12
|06.07.2023
|[[On the category of localizing motives]]
|Alexander Efimov
|-
|13
|13.07.2023
|Twisted ambidexterity in equivariant homotopy theory
|Bastiaan Cnossen
|-
|14
|20.07.2023
| (reserved)
|
|-
|}

<hr> <hr>

'''Winter Semester 22/23'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|20.10.2022
|Model categories for o-minimal geometry
|Reid Barton (Univ. Freiburg)
|-
|2
|27.10.2022
|
|
|-
|3
|03.11.2022 '''[online]'''
|The reductive Borel-Serre compactification as a model for unstable algebraic K-theory
|Mikala Ørsnes Jansen (Copenhagen)
|-
| 4
|10.11.2022
| [[Traces and categorification]]
| Bastiaan Cnossen (Bonn)
|-
|5
|17.11.2022
|no seminar
|
|-
|6
|24.11.2022
| [[Cut and paste invariants of manifolds via K-theory]]
| Julia Semikina (Münster)
|-
|7
|01.12.2022
|Discussion on Duality and Transfer I: Becker-Gottlieb transfer, Atiyah-Duality and A-theory transfer
|Bunke/Winges/Raptis
|-
|8
|08.12.2022
|Discussion on Duality and Transfer II: Fibrewise duality and transfer, functoriality
|N.N
|-
|9
|15.12.2022
|[[Unipotent homotopy theory of schemes]]
|Shubhodip Mondal (MPIM Bonn)
|-
|10
|22.12.2023
|[[The stable cohomology of symplectic groups of the integers]]
|Fabian Hebestreit (Aberdeen)
|-
|11
|12.01.2023
|[[The logic of étale maps]]
|Mathieu Anel (Carnegie Mellon University)
|-
|12
|19.01.2023
|[[Decoupling Moduli of Configurations Spaces on Surfaces]]
|Luciana Basualdo Bonatto (MPIM Bonn)
|-
|13
|26.01.2023
|The K_2-analogue of Bass-Quillen conjecture and A1-fundamental groups of Chevalley groups.
|Sergey Sinchuk (Munich, JetBrains GmbH)
|-
|14
|02.02.2023
|Genuine equivariant hermitian K-theory for finite groups
|Kaif Hilman (MPIM Bonn)
|-
|15
|09.02.2023
| Proper morphisms of infinity topoi
| Louis Martini (NTNU Trondheim)
|}

<hr><hr>

'''Summer Semester 2022'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|28.04.2022
| Devissage in algebraic K-theory (0)
| George Raptis
|-
|2
|05.05.2022
| Devissage in algebraic K-theory (1)
| Marco Volpe
|-
|3
|12.05.2022
|
|
|-
| 4
| 19.05.2022 '''[online]'''
| [[Universal cohomology theories]]
| Luca Barbieri Viale (Milan)
|-
|5
|26.05.2022
| Christi-Himmelfahrt
| -
|-
|6
| 02.06.2022
| [[Cdh motivic cohomology via prisms]]
| E. Elmanto (Harvard)
|-
|7
| 09.06.2022 '''[online]'''
| [[Exponential periods and o-minimality]]
| Johan Commelin (Freiburg)
|-
|8
| 16.06.2022
| Fronleichnam
| -
|-
|9
| 23.06.2022
| [[Excisive Approximation of l^1-Homology]]
| J. Witzig (Regensburg)
|-
|10
| 30.06.2022
|
|
|-
|11
| 07.07.2022
| Posets for which Verdier duality holds
| Ko Aoki (MPIM Bonn)
|-
|12
| 14.07.2022
| [[Synthetic (∞,1)-category theory in simplicial homotopy type theory]]
| Jonathan Weinberger (Johns Hopkins University)
|-
|13
| 21.07.2022
| Artin motivic tensor-triangular geometry
| Martin Gallauer (MPIM Bonn)
|-
|14
| 28.07.2022
| X. Bavarian Geometry & Topology Meeting
| (Augsburg)
|}

<hr><hr>

'''Winter Semester 2021/22'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|21.10.2021
| Derived microlocal sheaf theory
| Adeel Khan (Academia Sinica)
|-
|2
|28.10.2021
|
|
|-
|3
|4.11.2021
| Bounded cohomology and homotopy colimits
| George Raptis
|-
| 4
| 11.11.2021
| [[Filter Quotient ∞-Categories]]
| Nima Rasekh (EPFL)
|-
|5
|18.11.2021
| *****
| SFB Meeting in Windberg
|-
|6
| 25.11.2021
| [[Quadratic enrichments of enumerative counts using Atiyah-Bott localization]]
| Sabrina Pauli (Duisburg-Essen)
|-
|7
| 2.12.2021
| [[The Chow t-structure on the ∞-category of motivic spectra]]
| Tom Bachmann (LMU)
|-
|8
| 9.12.2021
| G-global homotopy theory and algebraic K-theory
| Tobias Lenz (Bonn)
|-
|9
| 16.12.2021
| *****
| [http://frenck.net/Math/BGTM/ 9th Bavarian Geometry & Topology Meeting]
|-
|10
| 13.1.2022
| [[cancelled]]
|
|-
|11
| 20.1.2022
| [[Topological Fukaya categories of symmetric powers]]
| Tobias Dyckerhoff (Hamburg)
|-
|12
| 27.1.2022
| [[Unstraightening for Segal spaces]]
| Joost Nuiten (Toulouse)
|-
|13
| 3.2.2022
| [[Polynomial monads, Grothendieck homotopy theory and delooping of spaces of long knots]]
| Michael Batanin (Prague)
|-
|14
| 10.2.2022
| [[Homotopy links and stratified homotopy theories]]
| Sylvain Douteau (Stockholm)
|}

AG-Seminar WS2021/22:

2025-11-13T18:27:16Z

Ghd08439:

'''AG Seminar'''

'''Description:''' The aim of the Seminar is to present and discuss recent results in research areas from Homotopy Theory and K-theory to Global Analysis.

'''Time and place:''' Thursday 12-14, SFB Lecture Hall.

'''Zoom Link:''' https://uni-regensburg.zoom.us/j/7601042838?pwd=bUVEaHhuY01abmo4T3Fza1NZMEVNUT09

'''Wintersemester 2025/26'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|16.10.2025
|
|
|-
|2
|23.10.2025
| DGAs with polynomial homology and applications
| Markus Land
|-
|3
|30.10.2025
|
|
|-
|4
|6.11.2025
| [[Duality for K-theory in motivic homotopy theory]]
| Jeroen Hekking
|-
|5
|13.11.2025
| '''talk Cancelled'''
|
|-
|6
|20.11.2025
| [[On Verdier Duality]]
| Georg Lehner (Universität Münster)
|-
|7
|27.11.2025
| [[Nori motivic sheaves as sheaves of Nori motives]]
| Luca Terenzi
|-
|8
|4.12.2025
| TBA
| Kaif Hilman
|-
|9
|11.12.2025
| TBA
| Nima Rasekh (Universität Greifswald)
|-
|10
|18.12.2025
| TBA
| Andreas Huber (Universität Augsburg)
|-
|11
|8.1.2026
|
|
|-
|12
|15.1.2026
|
|
|-
|13
|22.1.2026
| TBA
| Thomas Blom (MPIM Bonn)
|
|14
|29.1.2026
| TBA
| Oliver Bräunling (FH Dortmund)
|-
|15
|5.2.2026
| TBA
| Francesca Pratali (Utrecht University)
|}

<hr><hr>

'''Sommersemester 2025'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|24.4.2025
|Manifolds and analytic stacks
|J. Mann (Bonn)
|-
|2
|1.5.2025
|Holiday
|
|-
|3
|8.5.2025
| Effectivity of generalized double categories
| Félix Loubaton
|-
|4
|15.5.2025
|The tt-Spectrum of Integral Permutation Modules
| Juan Omar Gomez (Bielefeld)
|-
|5
|22.5.2025
|Constructible sheaves on toric varieties
|Remy van Dobben de Bruyn
|-
|6
|29.5.2025
|Holiday
|
|-
|7
|5.6.2025
|
|
|-
|8
|12.6.2025
| The real Betti realization of motivic Thom spectra and of very effective Hermitian K-theory
| Julie Bannwart
|-
|9
|19.6.2025
| Holiday
|
|-
|10
|26.6.2025
| [[The root functor]]
| Francesca Pratali
|-
|11
|3.7.2025
| Some remarks on exact categories and their K-theory
| Christoph Winges
|-
|12
|10.7.2025
| [[Unfolding of symmetric monoidal (∞,n)-categories]]
| Rune Haugseng
|-
|13
|17.7.2025
| On the categorification of homology
| Hadrian Heine
|-
|14
|24.7.2025
| tba
| Can Yaylali
|}

<hr><hr>

'''Wintersemester 24/25'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|17.10.2024
|[[(∞,2)-Topoi and descent]]
|Fernando Abellan Garcia (NTNU)
|-
|2
|24.10.2024
|
|
|-
|3
|31.10.2024
|The geometric diagonal of the special linear algebraic cobordism
|Egor Zolotarev (LMU)
|-
|4
|07.11.2024
|[[Purity for Algebraic Stacks]]
|Alessandro D'Angelo (KTH)
|-
|5
|14.11.2024
|
|
|-
|6
|21.11.2024
|Equivariant aspects of Hochschild homology
|Zhouhang Mao (Univ. Amsterdam)
|-
|7
|28.11.2024
|[[Proof of the Deligne-Milnor conjecture]]
|Massimo Pippi (Univ. Angers)
|-
|8
|05.12.2024
|[[Classification of n-connective (2n-2)-truncated spaces]]
|Daniel Exposito (Univ. Copenhagen)
|-
|9
|12.12.2024
|[[K-theory for analytic spaces]]
|Devarshi Mukherjee
|-
|10
|19.12.2024
|
|
|-
|11
|09.01.2025
|Grothendieck-Witt theory of derived schemes
|Marc Hoyois
|-
|12
|16.01.2025
|
|
|-
|13
|23.01.2025
|Model-Independent Lax Functors
|Johannes Gloßner
|-
|14
|30.01.2025
|[[Higher enhancements of mixed Hodge modules]]
|Swann Tubach (ENS Lyon)
|-
|15
|06.02.2025
|[[Limits of (∞, 1)-categories with Structure & Their Lax Morphisms]]
|Joanna Ko (Masaryk University)
|}

<hr><hr>

'''SOMMER Semester 2024'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|18.4.2024
|
|
|-
|2
|25.04.2024
| A Functorial Rectification of Finitely Cocomplete ∞-Categories
| Benni Ngo
|-
|3
|02.05.2024
| Perverse sheaves and weak Lefschetz theorems
| Denis-Charles Cisinski
|-
|4
|09.05.2024
| No Seminar (Christi Himmelfahrt)
|
|-
|5
|16.05.2024
| this week, the whole seminar moves to Greifswald
|
|-
|6
|23.05.2024
| Grothendieck construction and representation theorem for lax double presheaves
| Benedikt Fröhlich
|-
|7
|30.05.2024
| No seminar (Corpus Christi)
|
|-
|8
|06.06.2024
|[[Étale motives of geometric origin]]
| Raphaël Ruimy (Milan)
|-
|9
|13.06.2024
|[[A general Greenlees-Mays splitting principle]]
|Ivo Dell'Ambrogio (Lille)
|-
|10
|20.06.2024
|[[Categorical Künneth formulas]]
|Timo Richarz (TU Darmstadt)
|-
|11
|27.06.2024
|Conference
|
|-
|12
|04.07.2024
|[[The tempered dual of reductive symmetric spaces, C*-algebras, and K-theory]]
|Shintaro Nishikawa (Southampton)
|-
|13
|11.07.2024
|N.N
|Pelle Steffens (Munich)
|-
|14
|18.07.2024
| [[Animated λ-rings and Frobenius lifts]]
| Edith Hübner (Münster)
|-
|}

<hr><hr>

'''Winter Semester 2023/24'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|19.10.2023
|[[On the motivic Adams conjecture]]
|Alexey Ananyevskiy
|-
|2
|26.10.2023
|[[Dualizable categories and E-Theory]]
|Benjamin Dünzinger/Ulrich Bunke
|-
|3
|02.11.2023
|[[Dualizable categories and E-Theory-II]]
|Benjamin Dünzinger/Ulrich Bunke
|-
|4
|09.11.2023
|[[A pro-cdh topology and motivic cohomology of schemes]]
|Shuji Saito
|-
|5
|16.11.2023
|Cohomological invariants of quadrics via Morava motives
|Pavel Sechin
|-
|6
|23.11.2023
|Formal category theory within ∞-categorical proarrow equipments
|Jaco Ruit
|-
|7
|30.11.2023
|
|
|-
|8
|07.12.2023
|[[Motivic cohomology of mixed characteristic schemes]]
|Tess Bouis
|-
|9
|14.12.2023
|[[Six-functor formalisms are compactly supported]]
|Josefien Kuijper
|-
|10
|21.12.2023
|Towards a pro-étale homotopy type of schemes
| Sebastian wolf
|-
|11
|11.01.2024
|
|
|-
|12
|18.01.2024
|Gabber's presentation lemma over a general base
|Suraj Yadav
|-
|13
|25.01.2024
|[[Chow-Lefschetz motives]]
|Bruno Kahn
|-
|14
|01.02.2024
|[[Topological Modular Forms and supersymmetric quantum field theories]]
|Mayuko Yamashita
|-
|15
|08.02.2024
|[[Group completion of E_n-spaces and infinite products]]
|Georg Lehner (FU Berlin)
|-
|}

<hr><hr>

'''Summer Semester 2023'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|20.04.2023
|
|
|-
|2
|27.04.2023 '''12:30'''
|Universality and Examples in the Context of Functorial Semi-Norms (PhD defense)
|Johannes Witzig
|-
|3
|04.05.2023
|No seminar
|
|-
|4
|11.05.2023
|tba
|Hoang Kim Nguyen
|-
|5
|18.05.2023
|No seminar (holiday)
|
|-
|6
|25.05.2023
|[[Separability in homotopical algebra]]
|Maxime Ramzi (Copenhagen)
|-
|7
|01.06.2023
|[[Blow-ups and normal bundles in nonconnective derived geometry]]
|Jeroen Hekking
|-
|8
|08.06.2023
|No seminar (holiday)
|
|-
|9
|15.06.2023
|The theorem of the heart
|Giacomo Bertizzolo
|-
|10
|22.06.2023
|[[Shapes and locally constant sheaves]]
| Marc Hoyois
|-
|11
|29.06.2023
|Norms and Transfers in Motivic Homotopy Theory
|Brian Shin
|-
|12
|06.07.2023
|[[On the category of localizing motives]]
|Alexander Efimov
|-
|13
|13.07.2023
|Twisted ambidexterity in equivariant homotopy theory
|Bastiaan Cnossen
|-
|14
|20.07.2023
| (reserved)
|
|-
|}

<hr> <hr>

'''Winter Semester 22/23'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|20.10.2022
|Model categories for o-minimal geometry
|Reid Barton (Univ. Freiburg)
|-
|2
|27.10.2022
|
|
|-
|3
|03.11.2022 '''[online]'''
|The reductive Borel-Serre compactification as a model for unstable algebraic K-theory
|Mikala Ørsnes Jansen (Copenhagen)
|-
| 4
|10.11.2022
| [[Traces and categorification]]
| Bastiaan Cnossen (Bonn)
|-
|5
|17.11.2022
|no seminar
|
|-
|6
|24.11.2022
| [[Cut and paste invariants of manifolds via K-theory]]
| Julia Semikina (Münster)
|-
|7
|01.12.2022
|Discussion on Duality and Transfer I: Becker-Gottlieb transfer, Atiyah-Duality and A-theory transfer
|Bunke/Winges/Raptis
|-
|8
|08.12.2022
|Discussion on Duality and Transfer II: Fibrewise duality and transfer, functoriality
|N.N
|-
|9
|15.12.2022
|[[Unipotent homotopy theory of schemes]]
|Shubhodip Mondal (MPIM Bonn)
|-
|10
|22.12.2023
|[[The stable cohomology of symplectic groups of the integers]]
|Fabian Hebestreit (Aberdeen)
|-
|11
|12.01.2023
|[[The logic of étale maps]]
|Mathieu Anel (Carnegie Mellon University)
|-
|12
|19.01.2023
|[[Decoupling Moduli of Configurations Spaces on Surfaces]]
|Luciana Basualdo Bonatto (MPIM Bonn)
|-
|13
|26.01.2023
|The K_2-analogue of Bass-Quillen conjecture and A1-fundamental groups of Chevalley groups.
|Sergey Sinchuk (Munich, JetBrains GmbH)
|-
|14
|02.02.2023
|Genuine equivariant hermitian K-theory for finite groups
|Kaif Hilman (MPIM Bonn)
|-
|15
|09.02.2023
| Proper morphisms of infinity topoi
| Louis Martini (NTNU Trondheim)
|}

<hr><hr>

'''Summer Semester 2022'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|28.04.2022
| Devissage in algebraic K-theory (0)
| George Raptis
|-
|2
|05.05.2022
| Devissage in algebraic K-theory (1)
| Marco Volpe
|-
|3
|12.05.2022
|
|
|-
| 4
| 19.05.2022 '''[online]'''
| [[Universal cohomology theories]]
| Luca Barbieri Viale (Milan)
|-
|5
|26.05.2022
| Christi-Himmelfahrt
| -
|-
|6
| 02.06.2022
| [[Cdh motivic cohomology via prisms]]
| E. Elmanto (Harvard)
|-
|7
| 09.06.2022 '''[online]'''
| [[Exponential periods and o-minimality]]
| Johan Commelin (Freiburg)
|-
|8
| 16.06.2022
| Fronleichnam
| -
|-
|9
| 23.06.2022
| [[Excisive Approximation of l^1-Homology]]
| J. Witzig (Regensburg)
|-
|10
| 30.06.2022
|
|
|-
|11
| 07.07.2022
| Posets for which Verdier duality holds
| Ko Aoki (MPIM Bonn)
|-
|12
| 14.07.2022
| [[Synthetic (∞,1)-category theory in simplicial homotopy type theory]]
| Jonathan Weinberger (Johns Hopkins University)
|-
|13
| 21.07.2022
| Artin motivic tensor-triangular geometry
| Martin Gallauer (MPIM Bonn)
|-
|14
| 28.07.2022
| X. Bavarian Geometry & Topology Meeting
| (Augsburg)
|}

<hr><hr>

'''Winter Semester 2021/22'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|21.10.2021
| Derived microlocal sheaf theory
| Adeel Khan (Academia Sinica)
|-
|2
|28.10.2021
|
|
|-
|3
|4.11.2021
| Bounded cohomology and homotopy colimits
| George Raptis
|-
| 4
| 11.11.2021
| [[Filter Quotient ∞-Categories]]
| Nima Rasekh (EPFL)
|-
|5
|18.11.2021
| *****
| SFB Meeting in Windberg
|-
|6
| 25.11.2021
| [[Quadratic enrichments of enumerative counts using Atiyah-Bott localization]]
| Sabrina Pauli (Duisburg-Essen)
|-
|7
| 2.12.2021
| [[The Chow t-structure on the ∞-category of motivic spectra]]
| Tom Bachmann (LMU)
|-
|8
| 9.12.2021
| G-global homotopy theory and algebraic K-theory
| Tobias Lenz (Bonn)
|-
|9
| 16.12.2021
| *****
| [http://frenck.net/Math/BGTM/ 9th Bavarian Geometry & Topology Meeting]
|-
|10
| 13.1.2022
| [[cancelled]]
|
|-
|11
| 20.1.2022
| [[Topological Fukaya categories of symmetric powers]]
| Tobias Dyckerhoff (Hamburg)
|-
|12
| 27.1.2022
| [[Unstraightening for Segal spaces]]
| Joost Nuiten (Toulouse)
|-
|13
| 3.2.2022
| [[Polynomial monads, Grothendieck homotopy theory and delooping of spaces of long knots]]
| Michael Batanin (Prague)
|-
|14
| 10.2.2022
| [[Homotopy links and stratified homotopy theories]]
| Sylvain Douteau (Stockholm)
|}

AG-Seminar WS2021/22:

2025-05-21T13:03:28Z

Ghd08439:

'''AG Seminar'''

'''Description:''' The aim of the Seminar is to present and discuss recent results in research areas from Homotopy Theory and K-theory to Global Analysis.

'''Time and place:''' Thursday 12-14, SFB Lecture Hall.

'''Zoom Link:''' https://uni-regensburg.zoom.us/j/7601042838?pwd=bUVEaHhuY01abmo4T3Fza1NZMEVNUT09

'''Sommersemester 2025'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|24.4.2025
|Manifolds and analytic stacks
|J. Mann (Bonn)
|-
|2
|1.5.2025
|Holiday
|
|-
|3
|8.5.2025
| Effectivity of generalized double categories
| Félix Loubaton
|-
|4
|15.5.2025
|The tt-Spectrum of Integral Permutation Modules
| Juan Omar Gomez (Bielefeld)
|-
|5
|22.5.2025
|Constructible sheaves on toric varieties
|Remy van Dobben de Bruyn
|-
|6
|29.5.2025
|Holiday
|
|-
|7
|5.6.2025
|
|
|-
|8
|12.6.2025
| The real Betti realization of motivic Thom spectra and of very effective Hermitian K-theory
| Julie Bannwart
|-
|9
|19.6.2025
| tba
| Can Yaylali
|-
|10
|26.6.2025
| tba
| Francesca Pratali
|-
|11
|3.7.2025
| Some remarks on exact categories and their K-theory
| Christoph Winges
|-
|12
|10.7.2025
| tba
| Rune Haugseng
|-
|13
|17.7.2025
|
|
|-
|14
|24.7.2025
|
|
|}

<hr><hr>

'''Wintersemester 24/25'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|17.10.2024
|[[(∞,2)-Topoi and descent]]
|Fernando Abellan Garcia (NTNU)
|-
|2
|24.10.2024
|
|
|-
|3
|31.10.2024
|The geometric diagonal of the special linear algebraic cobordism
|Egor Zolotarev (LMU)
|-
|4
|07.11.2024
|[[Purity for Algebraic Stacks]]
|Alessandro D'Angelo (KTH)
|-
|5
|14.11.2024
|
|
|-
|6
|21.11.2024
|Equivariant aspects of Hochschild homology
|Zhouhang Mao (Univ. Amsterdam)
|-
|7
|28.11.2024
|[[Proof of the Deligne-Milnor conjecture]]
|Massimo Pippi (Univ. Angers)
|-
|8
|05.12.2024
|[[Classification of n-connective (2n-2)-truncated spaces]]
|Daniel Exposito (Univ. Copenhagen)
|-
|9
|12.12.2024
|[[K-theory for analytic spaces]]
|Devarshi Mukherjee
|-
|10
|19.12.2024
|
|
|-
|11
|09.01.2025
|Grothendieck-Witt theory of derived schemes
|Marc Hoyois
|-
|12
|16.01.2025
|
|
|-
|13
|23.01.2025
|Model-Independent Lax Functors
|Johannes Gloßner
|-
|14
|30.01.2025
|[[Higher enhancements of mixed Hodge modules]]
|Swann Tubach (ENS Lyon)
|-
|15
|06.02.2025
|[[Limits of (∞, 1)-categories with Structure & Their Lax Morphisms]]
|Joanna Ko (Masaryk University)
|}

<hr><hr>

'''SOMMER Semester 2024'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|18.4.2024
|
|
|-
|2
|25.04.2024
| A Functorial Rectification of Finitely Cocomplete ∞-Categories
| Benni Ngo
|-
|3
|02.05.2024
| Perverse sheaves and weak Lefschetz theorems
| Denis-Charles Cisinski
|-
|4
|09.05.2024
| No Seminar (Christi Himmelfahrt)
|
|-
|5
|16.05.2024
| this week, the whole seminar moves to Greifswald
|
|-
|6
|23.05.2024
| Grothendieck construction and representation theorem for lax double presheaves
| Benedikt Fröhlich
|-
|7
|30.05.2024
| No seminar (Corpus Christi)
|
|-
|8
|06.06.2024
|[[Étale motives of geometric origin]]
| Raphaël Ruimy (Milan)
|-
|9
|13.06.2024
|[[A general Greenlees-Mays splitting principle]]
|Ivo Dell'Ambrogio (Lille)
|-
|10
|20.06.2024
|[[Categorical Künneth formulas]]
|Timo Richarz (TU Darmstadt)
|-
|11
|27.06.2024
|Conference
|
|-
|12
|04.07.2024
|[[The tempered dual of reductive symmetric spaces, C*-algebras, and K-theory]]
|Shintaro Nishikawa (Southampton)
|-
|13
|11.07.2024
|N.N
|Pelle Steffens (Munich)
|-
|14
|18.07.2024
| [[Animated λ-rings and Frobenius lifts]]
| Edith Hübner (Münster)
|-
|}

<hr><hr>

'''Winter Semester 2023/24'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|19.10.2023
|[[On the motivic Adams conjecture]]
|Alexey Ananyevskiy
|-
|2
|26.10.2023
|[[Dualizable categories and E-Theory]]
|Benjamin Dünzinger/Ulrich Bunke
|-
|3
|02.11.2023
|[[Dualizable categories and E-Theory-II]]
|Benjamin Dünzinger/Ulrich Bunke
|-
|4
|09.11.2023
|[[A pro-cdh topology and motivic cohomology of schemes]]
|Shuji Saito
|-
|5
|16.11.2023
|Cohomological invariants of quadrics via Morava motives
|Pavel Sechin
|-
|6
|23.11.2023
|Formal category theory within ∞-categorical proarrow equipments
|Jaco Ruit
|-
|7
|30.11.2023
|
|
|-
|8
|07.12.2023
|[[Motivic cohomology of mixed characteristic schemes]]
|Tess Bouis
|-
|9
|14.12.2023
|[[Six-functor formalisms are compactly supported]]
|Josefien Kuijper
|-
|10
|21.12.2023
|Towards a pro-étale homotopy type of schemes
| Sebastian wolf
|-
|11
|11.01.2024
|
|
|-
|12
|18.01.2024
|Gabber's presentation lemma over a general base
|Suraj Yadav
|-
|13
|25.01.2024
|[[Chow-Lefschetz motives]]
|Bruno Kahn
|-
|14
|01.02.2024
|[[Topological Modular Forms and supersymmetric quantum field theories]]
|Mayuko Yamashita
|-
|15
|08.02.2024
|[[Group completion of E_n-spaces and infinite products]]
|Georg Lehner (FU Berlin)
|-
|}

<hr><hr>

'''Summer Semester 2023'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|20.04.2023
|
|
|-
|2
|27.04.2023 '''12:30'''
|Universality and Examples in the Context of Functorial Semi-Norms (PhD defense)
|Johannes Witzig
|-
|3
|04.05.2023
|No seminar
|
|-
|4
|11.05.2023
|tba
|Hoang Kim Nguyen
|-
|5
|18.05.2023
|No seminar (holiday)
|
|-
|6
|25.05.2023
|[[Separability in homotopical algebra]]
|Maxime Ramzi (Copenhagen)
|-
|7
|01.06.2023
|[[Blow-ups and normal bundles in nonconnective derived geometry]]
|Jeroen Hekking
|-
|8
|08.06.2023
|No seminar (holiday)
|
|-
|9
|15.06.2023
|The theorem of the heart
|Giacomo Bertizzolo
|-
|10
|22.06.2023
|[[Shapes and locally constant sheaves]]
| Marc Hoyois
|-
|11
|29.06.2023
|Norms and Transfers in Motivic Homotopy Theory
|Brian Shin
|-
|12
|06.07.2023
|[[On the category of localizing motives]]
|Alexander Efimov
|-
|13
|13.07.2023
|Twisted ambidexterity in equivariant homotopy theory
|Bastiaan Cnossen
|-
|14
|20.07.2023
| (reserved)
|
|-
|}

<hr> <hr>

'''Winter Semester 22/23'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|20.10.2022
|Model categories for o-minimal geometry
|Reid Barton (Univ. Freiburg)
|-
|2
|27.10.2022
|
|
|-
|3
|03.11.2022 '''[online]'''
|The reductive Borel-Serre compactification as a model for unstable algebraic K-theory
|Mikala Ørsnes Jansen (Copenhagen)
|-
| 4
|10.11.2022
| [[Traces and categorification]]
| Bastiaan Cnossen (Bonn)
|-
|5
|17.11.2022
|no seminar
|
|-
|6
|24.11.2022
| [[Cut and paste invariants of manifolds via K-theory]]
| Julia Semikina (Münster)
|-
|7
|01.12.2022
|Discussion on Duality and Transfer I: Becker-Gottlieb transfer, Atiyah-Duality and A-theory transfer
|Bunke/Winges/Raptis
|-
|8
|08.12.2022
|Discussion on Duality and Transfer II: Fibrewise duality and transfer, functoriality
|N.N
|-
|9
|15.12.2022
|[[Unipotent homotopy theory of schemes]]
|Shubhodip Mondal (MPIM Bonn)
|-
|10
|22.12.2023
|[[The stable cohomology of symplectic groups of the integers]]
|Fabian Hebestreit (Aberdeen)
|-
|11
|12.01.2023
|[[The logic of étale maps]]
|Mathieu Anel (Carnegie Mellon University)
|-
|12
|19.01.2023
|[[Decoupling Moduli of Configurations Spaces on Surfaces]]
|Luciana Basualdo Bonatto (MPIM Bonn)
|-
|13
|26.01.2023
|The K_2-analogue of Bass-Quillen conjecture and A1-fundamental groups of Chevalley groups.
|Sergey Sinchuk (Munich, JetBrains GmbH)
|-
|14
|02.02.2023
|Genuine equivariant hermitian K-theory for finite groups
|Kaif Hilman (MPIM Bonn)
|-
|15
|09.02.2023
| Proper morphisms of infinity topoi
| Louis Martini (NTNU Trondheim)
|}

<hr><hr>

'''Summer Semester 2022'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|28.04.2022
| Devissage in algebraic K-theory (0)
| George Raptis
|-
|2
|05.05.2022
| Devissage in algebraic K-theory (1)
| Marco Volpe
|-
|3
|12.05.2022
|
|
|-
| 4
| 19.05.2022 '''[online]'''
| [[Universal cohomology theories]]
| Luca Barbieri Viale (Milan)
|-
|5
|26.05.2022
| Christi-Himmelfahrt
| -
|-
|6
| 02.06.2022
| [[Cdh motivic cohomology via prisms]]
| E. Elmanto (Harvard)
|-
|7
| 09.06.2022 '''[online]'''
| [[Exponential periods and o-minimality]]
| Johan Commelin (Freiburg)
|-
|8
| 16.06.2022
| Fronleichnam
| -
|-
|9
| 23.06.2022
| [[Excisive Approximation of l^1-Homology]]
| J. Witzig (Regensburg)
|-
|10
| 30.06.2022
|
|
|-
|11
| 07.07.2022
| Posets for which Verdier duality holds
| Ko Aoki (MPIM Bonn)
|-
|12
| 14.07.2022
| [[Synthetic (∞,1)-category theory in simplicial homotopy type theory]]
| Jonathan Weinberger (Johns Hopkins University)
|-
|13
| 21.07.2022
| Artin motivic tensor-triangular geometry
| Martin Gallauer (MPIM Bonn)
|-
|14
| 28.07.2022
| X. Bavarian Geometry & Topology Meeting
| (Augsburg)
|}

<hr><hr>

'''Winter Semester 2021/22'''

'''Schedule'''

{|border="1"
!No
!Date
!Title / Abstract
!Speaker
|-
|1
|21.10.2021
| Derived microlocal sheaf theory
| Adeel Khan (Academia Sinica)
|-
|2
|28.10.2021
|
|
|-
|3
|4.11.2021
| Bounded cohomology and homotopy colimits
| George Raptis
|-
| 4
| 11.11.2021
| [[Filter Quotient ∞-Categories]]
| Nima Rasekh (EPFL)
|-
|5
|18.11.2021
| *****
| SFB Meeting in Windberg
|-
|6
| 25.11.2021
| [[Quadratic enrichments of enumerative counts using Atiyah-Bott localization]]
| Sabrina Pauli (Duisburg-Essen)
|-
|7
| 2.12.2021
| [[The Chow t-structure on the ∞-category of motivic spectra]]
| Tom Bachmann (LMU)
|-
|8
| 9.12.2021
| G-global homotopy theory and algebraic K-theory
| Tobias Lenz (Bonn)
|-
|9
| 16.12.2021
| *****
| [http://frenck.net/Math/BGTM/ 9th Bavarian Geometry & Topology Meeting]
|-
|10
| 13.1.2022
| [[cancelled]]
|
|-
|11
| 20.1.2022
| [[Topological Fukaya categories of symmetric powers]]
| Tobias Dyckerhoff (Hamburg)
|-
|12
| 27.1.2022
| [[Unstraightening for Segal spaces]]
| Joost Nuiten (Toulouse)
|-
|13
| 3.2.2022
| [[Polynomial monads, Grothendieck homotopy theory and delooping of spaces of long knots]]
| Michael Batanin (Prague)
|-
|14
| 10.2.2022
| [[Homotopy links and stratified homotopy theories]]
| Sylvain Douteau (Stockholm)
|}

Six-functor formalisms are compactly supported

2023-12-07T13:03:46Z

Ghd08439: Created page with "I will discuss a new infinity-categorical definition of abstract six-functor formalisms. Our definition is a variation on Mann's definition, with the additional requirement of..."

I will discuss a new infinity-categorical definition of abstract six-functor formalisms. Our definition is a variation on Mann's definition, with the additional requirement of having Grothendieck and Wirthmüller contexts, and recollements. Using Nagata's compactification theorem, we show that such a six-functor formalism can be given by just specifying adjoint triples for open immersions and on proper maps, satisfying certain compatibilities. Moreover, the existence of recollements is equivalent to a sheaf condition for a Grothendieck topology on the category of “varieties and spans with an open immersion and a proper map”. This brings to light an interesting analogy between six-functor formalisms and compactly supported cohomology. We can show that six-functor formalisms, in analogy with compactly supported cohomoloy, are uniquely determined by their restriction to smooth and complete varieties. Moreover we can characterize which lax symmetric monoidal functors from the category of complete varieties to the category of stable infinity-categories and adjoint triples, extend to six-functor formalisms.

AG-Seminar WS2021/22:

2023-12-07T13:02:57Z

Ghd08439: