AG-Seminar WS2021/22:

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

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	TBA	Andreas Huber (Universität Augsburg)
11	8.1.2026
12	15.1.2026	TBA	Dominik Kirstein
13	22.1.2026	TBA	Thomas Blom (MPIM Bonn)
14	29.1.2026	TBA	Oliver Bräunling (FH Dortmund)
15	5.2.2026	TBA	Fernando Abellan

---

---

Sommersemester 2025

Schedule

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

---

---

Wintersemester 24/25

Schedule

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)

---

---

SOMMER Semester 2024

Schedule

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)

---

---

Winter Semester 2023/24

Schedule

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)

---

---

Summer Semester 2023

Schedule

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)

---

---

Winter Semester 22/23

Schedule

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)

---

---

Summer Semester 2022

Schedule

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)

---

---

Winter Semester 2021/22

Schedule

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	*****	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)