Wintersemester 2023/24

31.01.2024 Bielefeld, U2-232, 14:15 - 15:45 & 16:15 - 17:45

Andrew Hubery (Bielefeld): "Categorification of non-crossing partitions"

Igor Burban (Paderborn): "Introduction to weighted projective lines IV"

24.01.2024 Paderborn, A3.339

14:00 -15:30: Stepan Maximov (Paderborn): "Regular decompositions and integrable systems"

17.01.2024 Paderborn, A3.339

15:30 - 17:00:  Georges Neaime (Bielefeld): "Elliptic theory for reflection groups and their Artin groups" 

17:30 - 19:00. Igor Burban (Paderborn): "Introduction to the theory of weighted projective lines II"

10.01.2024 Paderborn, A3.339, 14:00 - 15:30

Julien Pinske (Paderborn) "Non-Abelian Berry connections and their holonomy groups"

20.12.2023 Paderborn, A3.339, 14:00 - 15:30

Johannes Krah (Bielefeld) "Derived categories of blow-ups of the projective plane"

13.12.2023 Paderborn, A3.339, 14:00 - 15:30

Alexander Samokhin (Bielefeld) "Highest weight category structures on Rep(B) and full exceptional collections on flag varieties over the integers"

06.12.2023 Paderborn, A3.339

15:30 - 17:00:  Georges Neaime (Bielefeld): "Classical theory for reflection groups and their Artin groups" 

17:30 - 19:00. Igor Burban (Paderborn): "Introduction to the theory of weighted projective lines I"

22.11 .2023 Bielefeld, U2-232, 14:15 - 15:45 & 16:15 - 17:45

Igor Burban “Introduction to the theory of non-commutative exceptional curves ”
Barbara Baumeister “Hereditary categories, extended Weyl groups and the related Artin
groups”

25.10.2023 Paderborn, A3.339, 14:00 - 15:30

Marc Stephan "Perfect complexes with small homology over the group algebras"

18.10.2023 Paderborn, A3.339, 14:00 -15:30

Kyungmin Rho "lntroduction to Fukaya categories of surfaces II"

11.10.2023 Paderborn, A3.339, 14:00 - 15:30

Kyungmin Rho "lntroduction to Fukaya categories of surfaces I"

Sommersemester 2023

12.07.2023: Igor Burban (Paderborn), "Algebraic geometry of the fractional quantum Hall effect on a torus"

21.06.2023: joint Oberseminar Bielefeld-Paderborn (im Raum J3.330)

•     14:30-15:30: Okke van Garderen (Luxembourg), "The hidden symmetries of McKay quivers"
•     16:00-17:00: Sondre Kvamme (Trondheim), "Indecomposables in the monomorphism category"
•     17:15-18:15: Karin Erdmann (Oxford),  "Tame symmetric algebras"

14.06.2023:  Roman Fedorov (Kansas State/MPI Bonn): "Langlands duality for Hitchin systems"

07.06.2023: Daniel Perniok (Paderborn): "Direct sums and extensions of irreducible components of module varieties"

24.05.2023: Andrew Hubery (Bielefeld): "Connections on sheaves on weighted projective lines, and the Deligne-Simpson problem"

17.05.2023: Hans Franzen (Paderborn): "Cohomology of universal bundles on smooth projective quiver moduli spaces"

03.05.2023: Alexander Pütz (Paderborn): "Toric equivariant cohomology of quiver Grassmannian"

26.04.2023: Raschid Abedin (ETH Zürich): "On the classification of D-bialgebras on power series algebras"

19.04.2023: Daniel Orr (Virginia Tech/MPI Bonn): "From quantum toroidal algebras to wreath Macdonald operators"

05.04.2023: Mingyu Ni (Paderborn): "D-modules and geometric representation theory of real reductive groups"

Wintersemester 2022/23

25.01.2023: Joachim Hilgert (Paderborn): "Poisson transforms for symmetric spaces"

11.01.2023: Ghislain Fourier (Aachen): Degenerations of Lie algebras and flag varieties

21.12.2022: Alexey Kalugin (MPI Leipzig): Motivic quantization of Lie bialgebras

21.12.2022: Alexey Kalugin (MPI Leipzig): Motivic quantization of Lie bialgebras

30.11.2022: Alexander Stolin (Göteborg): Classification of Manin pairs and its relation with Yang-Baxter equations

23.11.2022: Pieter Belmans (Luxembourg): Hochschild cohomology of symmetric quotient stacks

16.11.2022: Sebastian Opper (Prague): Categories associated to punctured surfaces and actions of surface twist groups on triangulated categories

09.11.2022:  Victoria Hoskins (Nijmegen): Motivic mirror symmetry for Higgs bundles

Sommersemester 2022

06.07.2022: Mikhael Gekhtman (Notre Dame): "Twisted factorizations and multiple cluster structures in simple Lie groups" 

29.06.2022: Kai-Uwe Bux (Bielefeld): "Finitness properties of arithmetic groups via group actions"

15.06.2022: Daniel Labardini-Fragoso (Köln): "Gentle algebras arising from triangulations of surfaces with orbifold points"

01.06.2022: Andras Lörincz (Berlin): "On the collapsing of homogeneous bundles in arbitrary characteristic"

25.05.2022: Markus Reineke (Bochum): "Singular matrix tuples"

17.05.2022: Bill Crawley-Boevey (Bielefeld): "Semilinear clannish algebras"

11.05.2022: Ignacio Barros (Paderborn): "The Kodaira classification of the moduli of hyperelliptic curves"

04.05.2022: Stepan Maximov (Göteborg): "Lie bialgebra structures on g[[x]]"

03.04.2022:  Fabian Januszewski (Paderborn): "Tensorklassifikation von Harish-Chandra-Moduln für SL(2,R)"

Wintersemester 2021/22

01.02.2022: Barbara Baumeister (Bielefeld): "Die Korrespondenz zwischen erblichen Kategorien und nicht-kreuzenden Partitionen"

25.01.2022: Alexander Stolin (Göteborg): "Topological Lie bialgebras and Manin triples"

18.01.2022: Helge Glöckner (Paderborn): "Loop groups and Birkhoff decompositions"

11.01.2022: Dirk Kussin (Berlin): "Tubulare Kurven über perfekten Körpern"

21.12.2021: Hans Franzen (Bochum): "A GIT-free approach to moduli spaces of quiver representations"

14.12.2021: Helge Glöckner (Paderborn): "Infinite dimensional Poisson geometry"

07.12.2021: Markus Kirschmer (Paderborn): "Idealtheorie in zentraleinfachen Algebren"

23.11.2021: Raschid Abedin (Paderborn): "Classical Yang-Baxter equation and Lie bialgebra structures on Kac-Moody algebras - III"

16.11.2021: Raschid Abedin (Paderborn): "Classical Yang-Baxter equation and Lie bialgebra structures on Kac-Moody algebras - II"

09.11.2021: Raschid Abedin (Paderborn): "Classical Yang-Baxter equation and Lie bialgebra structures on Kac-Moody algebras - I"

26.10.2021: Igor Burban (Paderborn):  "Elliptic solutions of the associative Yang-Baxter equation and non-commutative curves"
 

Wintersemester 2019/20

29.01.2020: Peter Fiebig (Erlangen): "Lefschetz Operatoren, Hodge-Riemann Formen und Darstellungen"

29.01.2020: Martin Kalck (Freiburg): "Relative singularity categories: dg-models and applications"

15.01.2020: Fabian Januszewski (Paderborn): "(g, K)-Moduln über Q: Teil II"

08.01.2020: Wassilij Gnedin (Bochum): "Silting theory of orders modulo a regular sequence"

04.12.2019: Fabian Januszewski (Paderborn): "(g, K)-Moduln über Q: Teil I"

27.11.2019: Christian Okonek (Zürich): "Graded tilting for gauged Landau-Ginzburg models and geometric applications"

13.11.2019: David Ploog (Hannover): "Two braid group actions for Auslander algebras"

06.11.2019: Julia Sauter (Bielefeld): "On the tilting complexes of the Auslander algebra of the truncated polynomial ring"

16.10.2019:  Charles Vial (Bielefeld):  "The Chow motive of derived-equivalent surfaces"
 

Sommersemester 2019

10.07.2019: Helmut Lenzing (Paderborn): "On the algebraic theory of fuchsian singularities"

03.07.2019: Igor Burban (Paderborn): "Vector bundles on singular rational curves and matrix problems II"

26.06.2019: Helmut Lenzing (Paderborn): "Klein bottle, Möbius band and their non-commutative siblings"

19.06.2019: Shiquan Ruan (Bielefeld):  "Applications of mutations in the derived categories of weighted projective lines to Lie and quantum algebras"

05.06.2019: Zhengfang Wang (Bonn): "Algebraic structure on Tate-Hochschild cohomology"

29.05.2019: Jan Schröer (Bonn):  "Algebras associated with a Cartan datum"

22.05.2019: Wolfgang Soergel (Freiburg): "Kazhdan-Lusztig-Theory"

15.05.2019: Dirk Kussin (Bonn): "Tubular curves over finite fields"

24. 04.2019: Wassilij Gnedin (Bochum): "Homological features of ribbon graph orders"

17.04.2019: Semyon Klevtsov (Köln): "Geometry of Quantum Hall states"

10.04.2019: Claudia Alfes-Neumann (Paderborn): "Harmonic weak Maass forms and Harish-Chandra modules"
 

Wintersemester 2018/19

30.01.2019: Valery Lunts (Indiana): "On three notions of dimension in triangulated categories"

30.01.2019: Jörg Schürmann (Münster): "Chernsche Klassen von Schubert-Zellen in Flaggenvarietäten"

16.01.2019: Yuta Kimura (Bielefeld): "Module categories of derived and stable categories of hereditary algebras"

19.12.2018: Ksenia Fedosova (Freiburg): "Vector-valued automorphic forms and their Fourier expansions"

05.12.2018: Catharina Stroppel (Bonn): "Semi-infinite highest weight categories"

21. 11.2018: Raschid Abedin (Köln): "Die quasi-elliptische Lie-Bialgebra und ihr Zusammenhang mit der klassischen Yang-Baxter Gleichung"

07.11.2018: Matthias Wendt (Wuppertal): "Equivariant motives and geometric representation theory"

24.10.2018: Sebastian Opper (Paderborn): "Sphärische Komplexe auf Kodaira-Zykeln  und  gentle Algebren II"

17.10.2018: Sebastian Opper (Paderborn): "Sphärische Komplexe  auf Kodaira-Zykeln und gentle  Algebren I"
 

Sommersemester 2018

18.07.2018: Misha Feigin (Glasgow): "Quasi-invariants and Baker-Akhiezer functions for hyperplane arrangements"

11.07.2018: Olaf Schnürer (Paderborn): "Glattheit derivierter Kategorien von Algebren"

04.07.2018: Heike Herr (Paderborn): "U_q(g)-tilting modules in example sl_n"

27. 06.2018: Andrea Peruzzi (Paderborn): "Vector bundles and Yang-Baxter equations II"

20. 06. 2018: Lutz Hille (Münster): "Exzeptionelle Folgen und sphärische Moduln über der Auslander-Algebra von k[T]/T^n"

13.06.2018:  Andrea Peruzzi (Paderborn): "Vector bundles and Yang-Baxter equations I"

06.06.2018:     Dirk Kussin (Bonn): "Non-commutative regular projective curves"

30.05. 2018:   Andreas Krug (Marburg):   "Formality of P-objects"

23. 05.2018:   Sebastian Opper (Paderborn): "The surface of a gentle algebra IV"

16.05.2018:   Sebastian Opper (Paderborn): "The surface of a gentle algebra III"

02. 05. 2018:     Sebastian Opper (Paderborn): "The surface of a gentle algebra II"

25.04.2018: Sebastian Opper (Paderborn): "The surface of a gentle algebra I"

18.04.2018: Igor Burban (Paderborn): "Gentle algebras and matrix problems II"

11.04.2018: Igor Burban (Paderborn): "Gentle algebras and matrix problems I"