Bonn Topology Group

General Information - Members - Topology Seminar

Program of the topology seminar in previous semesters:

• WS2023-2024
• SS2023
• WS2022-2023
• SS2022
• WS2021-2022
• SS2021
• WS2020-2021
• SS2020
• WS2019-2020
• SS2019
• WS2018-2019
• SS2018
• WS2017-2018
• SS2017
• WS2016-2017
• SS2016
• WS2015-2016
• SS2015
• WS2014-2015
• SS2014
• WS2013-2014
• SS2013
• WS2012-2013
• SS2012
• WS2011-2012
• SS2011
• WS2010-2011
• SS2010
• WS2009-2010
• SS2009
• WS2008-2009
• SS2008
• WS2007-2008
• SS2007
• WS2006-2007
• SS2006
• WS2005-2006
• SS2005
• WS2004-2005
• SS2004
• WS2003-2004

WS2023-2024

October 17, 2023
Emma Brink (Universität Bonn): Condensed group cohomology
Abstract

October 24, 2023
Tommy Lundemo (Bergische Universität Wuppertal): Deformation theory in higher log geometry
Abstract

October 31, 2023
Sam Hughes (University of Oxford): Centralisers and classifying spaces for Out(F_N)
Abstract

November 7, 2023
Itamar Mor (Queen Mary University of London): Profinite Galois descent in K(n)-local homotopy theory
Abstract

November 14, 2023
Christian Carrick (Universiteit Utrecht): Chromatic defect, Wood's theorem, and higher real K-theories
Abstract

November 21, 2023
Adela Zhang (University of Copenhagen): Universal differentials in the bar spectral sequence
Abstract

November 28, 2023
Tom Bachmann (Universität Mainz): P-adic homotopy theory and E-infinity coalgebras
Abstract

December 5, 2023
Giles Gardam (Universität Bonn): The Kaplansky conjectures
Abstract

December 12, 2023
Nikolai Konovalov (MPIM Bonn): Algebraic Goodwillie spectral sequence
Abstract

January 9, 2024
Rin Ray (Universität Münster): Moduli Stacks of Curves in Homotopy Theory
Abstract

January 16, 2024
Christoph Winges (Universität Regensburg): The theorem of the heart fails in nonconnective K-theory
Abstract

January 23, 2024
Irakli Patchkoria (University of Aberdeen): Morava K-theory of infinite groups and Euler characteristic
Abstract

SS2023

• April 4, 2023
  no seminar
  
• April 11, 2023
  Victor Saunier
  The universal property of THH with coefficients and the Dundas-McCarthy theorem
  
• April 18, 2023
  no seminar
  
• April 25, 2023
  Thomas Schick
  Rigidity of scalar curvature and low regularity
  
• May 2, 2023
  no seminar
  
• May 9, 2023
  Matthias Kreck
  An overlooked problem: Betti numbers of closed manifolds
  
• May 16, 2023
  Jack Davies
  An algebro-geometric approach to cohomology operations
  
• May 23, 2023
  Roman Sauer
  Higher property T and cohomology of arithmetic lattices
  
• June 6, 2023
  no seminar
  
• June 13, 2023
  Maxim Ramzi
  Around the composition of Becker-Gottlieb transfers
  
• June 20, 2023
  Holger Reich
  Assembly, coassembly and the norm
  
• June 27, 2023
  no seminar tba
  
• July 4, 2023
  Wolfgang Steimle
  Grothendieck-Witt theory over the infinite cyclic and infinite dihedral groups
  
• July 11, 2023
  no seminar
  

WS 2022/23

Because of the activities of the HIM trimester program Spectral Methods in Algebra, Geometry, and Topology, there was no additional topology seminar at Bonn University during the winter term 2022/23.

SS2022

• April 12, 2022
  Markus Land (LMU München): On the K-theory of pushouts
  Abstract
• April 19, 2022
  Daniel Kasprowski (Universität Bonn): Counterexamples in 4-manifold topology
  Abstract
• April 26, 2022
  Kent Orr (Indiana University): Knot invariants and metabelian groups
  Abstract
• May 3, 2022
  Andy Baker (Glasgow University): The Steenrod algebra and its sub Hopf algebras as P-algebras w\ ith some applications in stable homotopy theory
  Abstract
• May 17, 2022
  Arunima Ray (MPIM Bonn): Slicing knots in definite 4-manifolds
• May 24, 2022
  Achim Krause (Universität Münster): On the K-theory of Z/pⁿ
  Abstract
• June 14, 2022
  Manuel Krannich (Karlsruhe Institute of Technology): The Disc-structure space
  Abstract
• June 21, 2022
  Carl-Friedrich Bödigheimer (Universität Bonn): Moduli spaces of surfaces: a short overview on some homology computations
  Abstract
• June 28, 2022
  Iuliia Semikina (Universität Münster): SK-groups and K-theory of manifolds
  Abstract
• July 12, 2022
  Irakli Patchkoria (University of Aberdeen): Derived infinity categories and algebraic models
  Abstract

WS2021-22

• October 26, 2021
  Boris Okun (University of Wisconsin Milwaukee): Homology growth in regular covers
  Abstract
• November 2, 2021
  Fabian Hebestreit (Universität Münster): Symplectic groups and Poincaré categories
  Abstract
• November 9, 2021
  Viktoriya Ozornova (MPIM Bonn): Complicial sets
  
• November 16, 2021
  Jack Davies (University of Utrecht): Stable operations on the universal elliptic cohomology theory
  Abstract
• November 23, 2021
  Florian Kranhold (Universität Bonn): Parametrised moduli spaces of surfaces as infinite loop spaces
  Abstract
• November 30, 2021
  Arthur Soulié (University of Glasgow): Stable homology of mapping class groups with some particular twisted contravariant coefficients
  Abstract
• January 11, 2022
  Marco Moraschini (Universität Regensburg/University of Bologna): On the simplicial volume and the Euler characteristic of (aspherical) manifolds
  Abstract
• January 18, 2022
  Georg Lehner (FU Berlin): The passage from the integral to the rational group ring in algebraic K-theory
  Abstract
• January 25, 2022
  Sil Linskens (Universität Bonn): Building global stable homotopy theory from equivariant stable homotopy theory
  Abstract
• February 1, 2022
  Shintaro Nishikawa (Universität Münster): On a controlled algebraic aspect of the gamma element method for the Baum-Connes conjecture
  Abstract

SS2021

• April 20th, 2021
  Mauricio Bustamante (University of Cambridge): Diffeomorphisms of solid tori
  
• April 27th, 2021
  Mikala Ørsnes Jansen (Københavns Universitet): The reductive Borel-Serre compactification and unstable algebraic K-theory
  
• May 4th, 2021
  Andrea Bianchi (Københavns Universitet): Mapping class groups on configuration spaces and the Johnson filtration
  
• May 11th, 2021
  Rune Haugseng (NTNU, Trondheim): Homotopy-coherent distributivity and the universal property of bispans
  
• May 18th, 2021
  Tobias Lenz (RFWU Bonn): G-global algebraic K-theory
  
• June 1st, 2021
  Hans-Werner Henn (Université de Strasbourg): On Hopkins' Picard groups
  
• June 8th, 2021
  Jens Eberhardt (RFWU Bonn): Algebraic K-Theory and Grothendieck-Witt theory in non-additive settings
  
• June 15th, 2021
  Rudolf Zeidler (WWU Münster): Scalar and mean curvature comparison via the Dirac operator
  
• June 22nd, 2021
  Calista Bernard (Stanford University): Twisted homology operations
  
• June 29th, 2021
  Andrew Blumberg (University of Texas, Austin): Floer homotopy theory and Morava K-Theory
  
• July 6th, 2021
  Rita Jiménez Rolland (UNAM Oaxaca): Puncture stability for the cohomology of mapping class groups
  
• July 13th, 2021
  Giles Gardam (WWU Münster): Kaplansky's conjectures
  
• July 20th, 2021
  Hadrian Heine (Universität Osnabrück): A coalgebra model for p-adic homotopy types
  

WS2020-2021

• October 27th, 2020
  Achim Krause (WWU Münster): The Picard group in equivariant homotopy theory via stable module categories
  Abstract, Notes
• November 3rd, 2020
  Jean Raimbault (Université Toulouse III, France): L^2-torsion on the character variety
  Abstract
• November 10th, 2020
  Jim Davis (Indiana University, Bloomington, USA): Hyperfield Grassmannians
  Abstract
• November 17th, 2020
  Georg Tamme (Universität Regensburg): Purity in chromatically localized algebraic K-theory
  Abstract
• November 24th, 2020
  Geoffroy Horel (Université Paris XIII, France): Galois Symmetries of knot spaces
  
• December 1st, 2020
  Andrew Senger (MIT, Boston, USA): Boundaries of highly connected, almost closed manifolds
  
• December 8th, 2020
  Jeremy Hahn (MIT, Boston, USA): More highly connected manifolds
  
• December 15th, 2020
  Allen Yuan (Columbia University, New York City, USA): Ambidexterity phenomena at height 1
  
• January 12th, 2021
  Sherry Gong (Standford University, Palo Alto, USA): Invariants of knots and links
  
• January 19th, 2021
  Daniel Berwick-Evans (University of Illinois at Urbana-Champaign, USA): How do field theories detect the torsion in topological modular forms?
  
• January 26th, 2021
  Ben Knudsen (Northeastern University, Boston, USA): Smooth structures and embedding calculus
  Abstract
• February 2nd, 2021
  Asaf Horev (Stockholms Universitet, Sweden): Genuine equivariant factorisation homology
  
• February 9th, 2021
  Scott Balchin (MPIM): Exploring the Balmer spectra of rational G-spectra
  

SS2020

• April 21st, 2020
  Søren Galatius (Københavns Universitet, Denmark): The action of Aut(C) on symplectic K-theory of the integers
  Abstract
  
• April 28th, 2020
  Oscar Randal-Williams (University of Cambridge, UK): E_∞-algebras and general linear groups
  Abstract
  
• May 12th, 2020
  Manuel Krannich (University of Cambridge, UK): The pseudo-isotopy stable range
  Abstract
  
• May 19th, 2020
  Julia Semikina (RFWU Bonn): Cut-and-past invariants of manifolds via algebraic K-theory
  Abstract
  
• May 26th, 2020
  David Rosenthal (St. John's University, New York City, USA): Finitely F-amenable actions and decomposition complexity of groups
  Abstract
  
• June 9th, 2020
  Niko Naumann (Universität Regensburg): The conjectures of Hovey/Strickland and Chai
  Abstract
  
• June 16th, 2020
  Natàlia Castellana (Universitat Autònoma de Barcelona, Spain): Local Gorenstein duality
  Abstract
  
• June 23rd, 2020
  Vincent Braunack-Mayer (New York University Abu Dhabi, UAE): Modules, comodules and rational homotopy theory
  Abstract
  
• July 7th, 2020
  Fabian Henneke (RFWU Bonn): Group rings of free-by-cyclic groups are pseudo-Sylvester domains
  
• July 14th, 2020
  Lennart Meier (Universiteit Utrecht): Groups and group laws behind equivariant cohomology theories
  Abstract
  

WS2019-2020

• October 15th 2019
  Steffen Kionke (KIT, Karlsruhe): Limits of topological invariants in the p-adic numbers
  Abstract
  
• October 22nd 2019
  Diego Lopez Alvarez (MPIM, Bonn): The strong Atiyah conjecture for the families of locally indicable and one-relator groups
  Abstract
  
• October 29th 2019
  Siegfried Echterhoff (WWU Münster): The Baum-Connes Conjecture
  Abstract
  
• November 5th 2019
  Markus Hausmann (RFWU Bonn): Equivariant formal group laws and complex cobordism
  Abstract
  
• November 12th 2019
  Ian Hambleton (McMaster University, Hamilton, Canada): Rank conditions for finite group actions on 4-manifolds
  Abstract
  
• November 19th 2019
  Thomas Nikolaus (WWU Münster): On the Beilinson fibre sequence
  Abstract
  
• November 26th 2019
  Pavle Blagojevic (FU Berlin/SANU Belgrade, Serbia): On a vector bundle which cuts, bounces, embeds and measures waists
  Abstract
  
• December 3rd 2019
  Lior Yanovski (MPIM, Bonn): Higher semiadditivity (a.k.a. ambidexterity) and chromatic homotopy theory
  Abstract
• January 7th 2020
  Anthony Conway (MPIM, Bonn): Non-slice linear combinations of iterated torus knots
  Abstract
• January 14th 2020
  Richard Hepworth (University of Aberdeen, UK): Homological stability for algebras
  Abstract
• January 21st 2020
  Emanuele Dotto (University of Warwick, Coventry, UK): The Grothendieck-Witt theory of quadratic functors
  Abstract
  
• January 28th 2020
  Piotr Pstragowski (Københavns Universitet, Denmark): Synthetic spectra
  Abstract
  

SS2019

• April 9th
  Mark Powell (Durham University, England): The sphere embedding theorem
  Abstract
  
• April 16th
  Giles Gardam (WWU Münster): Boundaries of hyperbolic and CAT(0) groups and Cannon-Thurston maps
  Abstract
  
• April 23rd
  Johan Konter (Stockholms Universitet, Sweden): Homology of infinite loop spaces
  Abstract
  
• April 30th
  Tyler Lawson (MPIM, Bonn / University of Minnesota, Minneapolis-St. Paul, USA): Adjoining roots in algebra and topology
  Abstract
  
• May 7th
  Andrew Baker (University of Glasgow, Scotland): Stable Homotopy of CW R-modules
  Abstract
  
• May 14th
  Markus Land (Universität Regensburg): On the K-theory of pullbacks
  Abstract
  
• May 21st
  Andrea Bianchi (RFWU Bonn): Splitting of the homology of the punctured mapping class group
  Abstract
  
• May 28th
  Christoph Winges (RFWU Bonn): Coarse homology theories and assembly maps
  Abstract
  
• June 4th
  Irakli Patchkoria (University of Aberdeen, Scotland): Proper equivariant stable homotopy theory
  Abstract
  
• June 18th
  Gijs Heuts (Universiteit Utrecht, The Netherlands): Koszul duality in v_n-periodic homotopy theory
  
• June 25th
  Mario Salvetti (Univerisità di Pisa, Italy): Cohomology of superelliptic families and complex braid groups
  Abstract
  
• July 2nd
  Jesper Grodal (Københavns Universitet, Denmark): String topology of finite groups of Lie type
  Abstract
  
• July 9th
  Joost Nuiten (Université de Montpellier, France): A van Est theorem in derived geometry
  Abstract
  

WS2018 - 2019

• October 16th
  Nima Rasekh (MPIM, Bonn): The fundamental group and natural number objects
  Abstract
  
• October 23rd
  Falk Beckert (MPIM, Bonn): Higher symmetries on stable homotopy theories
  Abstract
  
• October 30th
  Lauren Bandklayder (MPIM, Bonn): The Dold-Thom theorem via factorization homology
  Abstract
  
• November 6th
  Jens Reinhold (Stanford University): Manifold bundles over surfaces
  Abstract
  
• November 13th
  Dustin Clausen (RFWU Bonn): The algebraic topology of p-adic Lie groups
  Abstract
  
• November 20th
  Grigori Avramidi (WWU Münster/MPIM, Bonn): Coarse embeddings, Moore spaces, and L^2 Betti numbers
  
• November 27th
  Lukas Lewark (Universität Bern): Linking pairings and unknotting numbers
  Abstract
  
• December 11th
  Benjamin Böhme (Universität Bonn): Idempotent splittings of G-equivariant commutative ring spectra
  Abstract
  
• January 8th
  Bruno Stonek (MPIM Bonn): Higher THH of KU
  Abstract
  
• January 15th
  Rachel Skipper (GAU Göttingen/ENS de Lyon): Finiteness properties of simple groups
  Abstract
  
• January 29th
  Wolfgang Steimle (Universität Augsburg): On the h-cobordism category
  Abstract
  

SS2018

• April 10th
  Emanuele Dotto (Universität Bonn): Witt vectors, polynomiality, and the dihedral fixed-points of THH
  Abstract
  
• April 17th
  Rachel Boyd (University of Aberdeen): Homological stability for Artin monoids
  Abstract
  
• May 8th
  Bernhard Hanke (Universität Augsburg): An equivariant Quillen theorem
  Abstract
  
• May 15th
  Denis Nardin (Université Paris 13): A universal property for Hermitian K-theory
  Abstract
  
• May 29th
  Mauricio Bustamente (Universität Augsburg): Bundles with fiberwise negatively curved metrics
  Abstract
  
• June 5th
  Nathalie Wahl (Københavns Universitet): Stability and stable homology of classical groups
  Abstract
  
• June 12th
  Beren Sanders (EPF Lausanne): Quillen stratification for the Balmer spectrum with applications
  Abstract
  
• June 19th
  Christopher Davis (University of California, Irvine): On the absolute de Rham-Witt complex over W(k) and over perfectoid rings
  Abstract
  
• June 26th
  Ian Leary (University of Southampton): Generalized Bestvina-Brady groups and their applications
  Abstract
  
• July 3rd
  Damian Osajda (Uniwersytet Wroclawski): Two-dimensional Artin groups and systolicity
  Abstract
  
• July 10th
  Steffen Sagave (Radboud Universiteit Nijmegen): Multiplicative structures on Thom spectra and parametrized spectra
  Abstract
  

WS2017-18

• 10 October 2017
  ARUNIMA RAY (MPIM Bonn): 4-dimensional analogues of Dehn's lemma
  Abstract
  
• 17 October 2017
  AKHIL MATHEW (University of Chicago): A gentle approach to the de Rham-Witt complex
  Abstract
  
• 24 October 2017
  JINGYIN HUANG (MPIM Bonn/McGill University): Uniform lattices acting on RAAG complexes
  Abstract
  
• 7 November 2017
  EVA HÖNING (MPIM Bonn/Université Paris 13): The topological Hochschild homology of algebraic K-theory of finite fields
  Abstract
  
• 14 November 2017
  MAGDALENA KEDZIOREK (MPIM Bonn/EPFL): An algebraic model for rational G-spectra
  Abstract
  
• 28 November 2017
  BOGDAN GHEORGHE (MPIM Bonn/Wayne State University): Motivic Homotopy Theory without Schemes
  Abstract
  
• 5 December 2017
  MANUEL ARAÚJO (MPIM Bonn/University of Oxford): Bordism and duality in low dimensions
  Abstract
  
• 12 December 2017
  ARTHUR SOULIÉ (Université de Strasbourg): Long-Moody construction and polynomial functors
  Abstract
  
• 9 January 2018
  LUKAS BRANTNER (MPIM Bonn): Operations on Spectral Lie Algebras and a Conjecture of Ravenel
  Abstract
  
• 16 January 2018
  MANUEL KRANNICH (University of Copenhagen): On characteristic classes of exotic manifold bundles
  Abstract
  
• 23 January 2018
  FEDERICO CANTERO MORÁN (Universitat de Barcelona): The space of merging submanifolds
  Abstract
  
• 30 January 2018
  TOMASZ PRYTUŁA (University of Southampton): Classifying space for proper actions for groups admitting a strict fundamental domain
  Abstract
  

SS2017

• April 25th 2017
  CHRISTOPH WINGES (MPIM, Bonn): Automorphisms of manifolds and the Farrell-Jones conjectures
  Abstract
  
• May 2nd 2017
  JOHANNES EBERT (WWU Münster): The positive scalar curvature cobordism category
  Abstract
  
• May 9th 2017
  MARTIN PALMER (Universität Bonn): Twisted homological stability and homological representations of braid groups
  Abstract
  
• May 16th 2017
  SEAN TILSON (Universität Wuppertal): Squaring operations in the Motivic and C_2-equivariant Adams spectral sequence
  Abstract
  
• May 23rd 2017
  AKHIL MATHEW (Harvard University): Nonconnective simplicial commutative rings
  Abstract
  
• May 30th 2017
  IAN HAMBLETON (McMaster University, Hamilton, Canada): Group actions on rational homology 3-spheres
  Abstract
  
• June 13th 2017
  MARC STEPHAN (UBC, Vancouver, Canada): Free (Z/p)^n-actions and p-DG modules
  Abstract
  
• June 27th 2017
  DREW HEARD (Universität Hamburg): Ascent for stratifications
  Abstract
  
• July 4th 2017
  GEORGIOS RAPTIS (Universität Regensburg): Devissage theorems in K-theory
  Abstract
  
• July 11th 2017
  CHRISTIAN AUSONI (Université Paris 13): On the topological Hochschild homology of E(2)
  Abstract
  
• July 18th 2017
  PETER ARNDT (Heinrich Heine Universität Düsseldorf): Motivic Homotopy Theory over deeper bases
  Abstract
  
• July 25th 2017
  TOBIAS BARTHEL (Københavns Universitet, Denmark): The boundary of chromatic homotopy theory
  Abstract
  

WS2016-2017

• September 13th 2016
  GEOFFROY HOREL (MPIM, Bonn): Interactions between operads and motives
  
• September 20th 2016
  HOLGER KAMMEYER (KIT, Karlsruhe): L^2-invariants of groups and knots
  
• September 27th 2016
  CHRISTOPHER DAVIS (University of Wisconsin, Eau Claire): An overview of knot concordance and 4-manifolds
  
• October 11th 2016
  DANIEL KASPROWSKI (MPIM, Bonn): Injectivity of assembly maps
  
• November 2nd 2016
  KRISTIAN MOI (WWU Münster): Real algebraic K-theory and its traces
  
• November 15th 2016
  SUNE PRECHT REEH (MIT, Cambridge, USA): Representations, dimension functions, and fusion systems
  
• November 29th 2016
  GIJS HEUTS (University of Copenhagen): Lie algebras and v_n-periodic spaces
  
• December 13st 2016
  EMANUELE DOTTO (Universität Bonn): Equivariant diagrams and functor calculus
  

SS2016

• 19 April 2016
  DIARMUID CROWLEY (Aberdeen): Manifolds which are like the Associative Grassmannian
  Abstract
  
• 26 April 2016
  ARTHUR BARTELS (Münster): The Farrell-Jones Conjecture for Mapping Class Groups
  
• 3 Mai 2016
  SAM NARIMAN (Münster): On homology of diffeomorphism groups made discrete
  
• 10 Mai 2016
  BEN ANTIEAU (Illinois): Negative and homotopy K-theory of ring spectra and extensions of the theorem of the heart
  Abstract
  
• 24 Mai 2016
  MICHAEL WEISS (Münster): Configuration categories of manifolds and some relations to topological embeddings
  
• 31 Mai 2016
  MATTHIAS GREY (Bonn): On rational homological stability for automorphisms of manifolds
  
• 7 Juni 2016
  RUDI ZEIDLER (Göttingen): Secondary coarse index theory for positive scalar curvature
  
• 14 Juni 2016
  GREG ARONE (Stockholm): An EHP sequence of topological monoids
  
• 21 Juni 2016 starts at 16:30 !
  ACHIM KRAUSE (Bonn): G_2/SO_4
  
• 28 Juni 2016
  PAUL BALMER (UCLA): Separable extensions in stable homotopy theory
  Abstract
  
• 5 Juli 2016
  MARCO VARISCO (Albany): Assembly maps for topological cyclic homology
  Abstract
  
• 12 Juli 2016
  DANIELA EGAS SANTANDER (FU Berlin): Sullivan diagrams and homological stability
  

WS2015-2016

• 27 October 2015
  VIKTORIYA OZORNOVA (Bonn): Fibrancy of Categories
  
• 3 November 2015
  CARMEN ROVI (MPI): The signature modulo 8 of a fibration
  Abstract
  
• 10 November 2015
  JAN STOVICEK (Prague): Reflection functors in abstract homotopy theory
  
• 17 November 2015
  MORITZ GROTH (Bonn): Universal tilting modules via abstract homotopy theory
  
• 24 November 2015
  WERNER THUMANN (MPI): Fundamental groups of discrete operads and their finiteness properties
  
• 1 December 2015
  TYRONE CRISP (MPI): Parabolic induction, adjunction, and assembly
  
• 8 December 2015
  PAUL KIRK (Indiana/MPI): Lagrangian-Floer homology of traceless SU(2) character varieties of tangle decompositions
  Abstract
  
• 15 December 2015
  CLARK BARWICK (MIT): Cyclotomic spectra and the noncommutative syntomic realization
  Abstract
  
• 12 January 2016
  LENNART MEIER (Bonn): Homotopy theory of relative categories
  Abstract
  
• 26 January 2016
  FABIAN HEBESTREIT (Bonn): Twisted spin cobordism and positive scalar curvature
  Abstract
  
• 2 February 2016
  GEOFFROY HOREL (MPI): Motivic homological stability for configurations spaces of the affine line
  

SS2015

• 21 April 2015
  MATTHIAS BLANK (Regensburg): Bounded Cohomology for Groupoids and Mapping Theorems
  
From May onwards at HIM, Poppelsdorfer Allee 45.


• 12 May 2015
  Introduction of the participants of the HIM Trimester program
  
  
• The remaining program will be announced at the web page of the HIM Trimester program Homotopy theory, manifolds, and field theories
  

WS2014-2015

• 3 February 2015
  ULRICH BUNKE (Regensburg): Algebraic K-theory of smooth functions and index theory
  Notes
  
• 27 January 2015
  THOMAS NIKOLAUS (Bonn): Introduction to Topological Stacks
  
• 13 January 2015
  MICHAEL GROECHENIG (Imperial College, London): The K-theory of Tate objects
  Abstract
  
• 9 December 2014
  CRISTINA PAGLIANTINI (ETH Zurich): Simplicial volume vs integral foliated simplicial volume
  Abstract
  
• 2 December 2014
  DANIEL KASPROWSKI (Bonn): On the K-theory of groups with finite decomposition complexity
  Abstract
  
• 25 November 2014
  DAVID GEPNER (Purdue): Localization sequences in the algebraic K-theory of ring spectra
  
• 18 November 2014
  TOBIAS DYCKERHOFF (Bonn): Topological Fukaya categories of surfaces
  
• 11 November 2014
  MARK POWELL (MPI): Slice knots and Casson towers
  Abstract
  
• 4 November 2014
  CLARA LOEH (Regensburg): Integral approximations of simplicial volume
  
• 21 October 2014
  CHRISTIAN WEGNER (Bonn): The Farrell-Jones conjecture for solvable groups
  
• 14 October 2014
  JEREMIAH HELLER (Bonn): Galois equivariance and motivic homotopy theory
  

SS2014

• 8 Juli 2014
  XIAOLEI WU (Binghamton): The Farrell-Jones Conjecture for the Baumslag-Solitar groups
  Abstract
  
• 1 Juli 2014
  QAYUM KHAN (Indiana): Free transformations of S^1 \times S^n of prime period
  Abstract
  
• 24 Juni 2014
  DANIELA EGAS (Kopenhagen): Comparing combinatorial models of Moduli space
  
• 17 Juni 2014
  LENNART MEIER (Virginia): Homotopy Fixed Points of Landweber Exact Spectra
  Abstract
  
• 27 Mai 2014
  BERNHARD HANKE (Augsburg): The moduli space of metrics of positive scalar curvature
  
• 20 Mai 2014
  SEBASTIAN GOETTE (Freiburg): The Crowley-Nordström \nu-Invariant
  Abstract
  
• 13 Mai 2014
  DIARMUID CROWLEY (Bonn): The extended Eells-Kuiper invariant and G_2-topology
  Abstract
  
• 6 Mai 2014
  KRISTIAN MOI (Kopenhagen): Deloopings in Real algabraic K-theory
  Abstract
  
• 29 April 2014
  HANS-WERNER HENN (Strasbourg): On Hopkins' K(2)-local Picard groups
  
• 15 April 2014
  WOLFGANG STEIMLE (Bonn): The space of metrics of positive scalar curvature
  Abstract
  

WS2013-2014

• 28 Januar 2014
  KAROL SZUMILO (Bonn):Cofibration categories and quasicategories
  Abstract
  
• 21 Januar 2014
  MATTHEW MORROW (Bonn): Continuity of topological cyclic homology
  
• 14 Januar 2014
  RUTH KELLERHALS (Fribourg): Hyperbolic orbifolds of minimal volume
  Abstract
  
• 7 Januar 2014
  MARTIN LUSTIG (Marseille): Fixed currents for hyperbolic automorphisms of free groups
  Abstract
  
• 10 December 2013
  THOMAS NIKOLAUS (MPIM/Regensburg): T-Duality in K-theory and elliptic cohomology
  
• 3 December 2013
  THOMAS SCHICK (Göttingen): Mapping the surgery exact sequence to analysis using higher index theory
  Abstract
  
• 26 November 2013
  MARCUS ZIBROWIUS (Wuppertal): KO-Theory of Thom Spaces over Flag Manifolds
  Abstract
  
• 19 November 2013
  HAGGAI TENE (Bonn): On the product in negative Tate cohomology
  Abstract
  
• 12 November 2013
  MARCEL BOEKSTEDT (Aarhus): Configuration spaces and symmetric powers of surfaces
  
• 29 Oktober 2013
  DAVID AYALA (USC): Poincaré-Koszul duality
  Abstract
  
• 22 Oktober 2013
  HOLGER KAMMEYER (Bonn): L^2-invariants of nonuniform lattices in semisimple Lie groups
  Abstract
  

SS2013

• 16 July 2013
  David Gepner (REGENSBURG): Moduli stacks of modules for associative ring spectra
  
• 9 July 2013
  Filipp Levikov (MUENSTER): (Completed) cyclotomic trace and quadratic L-theory
  
• 2 July 2013
  Gereon Quick (MUENSTER): Hodge filtered complex bordism
  
• 25 June 2013
  Dieter Degrijse (LEUVEN): Bredon cohomological dimensions for proper actions and Mackey functors
  
• 18 June 2013
  Fabian Lenhardt (BERLIN): The Baum-Connes conjecture for topologists
  
• 11 June 2013
  Greg Arone (VIRGINIA): The equivariant homology of the partition poset, revisited.
  
• 4 June 2013
  Manuel Amann (KARLSRUHE): Topological properties of positively curved manifolds with symmetry
  
• 14 May 2013
  The seminar slot is taken by a talk at MPI by Jim Conant/Rob Schneidermann about Whitney towers.
  
• 7 May 2013
  Alejandro Adem (UBC, VANCOUVER): Homotopy Colimits and a Classifying Space for Commutativity
  Eric Friedlander (USC, LOS ANGELES): Support Varieties for Rational G-modules
  
• 23 April 2013
  Holger Reich (FU BERLIN): Algebraic K-Theory of Group Rings and Topological Cyclic Homology
  
• 16 April 2013
  Roman Sauer (KARLSRUHE): L^2-invisibility and self-similar groups
  
• 9 April 2013
  Moritz Rodenhausen (BONN): Centralisers of polynomially growing automorphisms of free groups
  

WS2012-2013

• 29 January 2013
  ANSSI LAHTINEN (Copenhagen): String topology of classifying spaces
  
• 22 January 2013
  At 16:00 ILYA GRIGORIEV (Stanford): Relations among characteristic classes of manifold bundles
  At 17:00 VIKTORIYA OZORNOVA (Bonn): On the K(\pi, 1)-conjecture for Artin groups
  
• 15 January 2013
  GIOVANNI GANDINI (Bonn): Finiteness properties of groups
  
• 8 January 2013
  Instead of the seminar there is the first talk in the series by MICHAEL FREEDMAN with the title
  "Bing topology and Casson handles" at MPI (broadcast from UC Santa Barbara).
  
• 11 December 2012
  ALEXANDER KUPERS (Stanford): String topology and radial slit configurations
  Abstract
  
• 4 December 2012
  SPIROS ADAMS-FLOROU (Muenster): Subdivision and squeezing
  Abstract
  
• 27 November 2012
  CHRIS SCHOMMER-PRIES (MPI): The Unicity of the homotopy theory of higher categories
  Abstract
  
• 20 November 2012
  CHRISTIAN SCHLICHTKRULL (Bergen): Logarithmic topological Hochschild homology
  
• 13 November 2012
  CONSTANZE ROITZHEIM (Kent): Modular Rigidity of E-local Spectra
  Abstract
  
• 6 November 2012
  HENRIK RUEPING (Bonn): The Farrell-Jones conjecture for some general linear groups
  
• 30 Oktober 2012
  BERNARDO URIBE (Bonn): Universal twist in equivariant K-theory for proper and discrete actions
  Abstract
  
• 23 Oktober 2012
  DIETMAR BISCH (Vanderbilt): Subfactors with small Jones index
  
• 16 October 2012
  DAVID BLANC (Haifa): Higher track categories & derived functors and the Adams spectral sequence
  
• 9 October 2012
  WOLFGANG STEIMLE (Bonn): Approximate Fibrations and Farrell-Jones Conjectures
  

SS2012

• 10 July 2012
  LARS HESSELHOLT (Nagoya, Copenhagen): Real algebraic K-theory
  
• 3 July 2012
  ANTONIO SARTORI (Bonn): From Khovanov homology towards gl(1|1) categorification
  
• 19 June 2012
  TIMO SCHÜRG (MPIM): A quick introduction to derived algebraic geometry
  
• 12 June 2012
  SØREN GALATIUS (Stanford, Copenhagen): Homological stability for moduli spaces of manifolds
  Abstract
• 12 June 2012
  ULRIKE TILLMANN (Oxford): From braid groups to mapping class groups
• 22 May 2012
  STEFFEN SAGAVE (Bonn): Logarithmic structures on K-theory spectra
  
• 15 May 2012
  WILHELM SINGHOF (Düsseldorf): On the mapping class groups of non-orientable surfaces
  
• 8 May 2012
  ANDY BAKER (Glasgow): BP: close encounters of the E-infinity kind
  Abstract
  
• 24 April 2012
  CLEMENS BERGER (Nice, MPIM): Lifting left properness to monoids and related structures
  Abstract
  
• 17 April 2012
  MICHAEL BATANIN (Sydney, MPIM): Colimits of algebras over polynomial monads
  Abstract
  
• 10 April 2012
  STEFAN FRIEDL (Köln): Agol's theorem - is the end of 3-manifold topology near?
  
• 3 April 2012
  DANIEL JUAN-PINEDA (CCM-UNAM): The K-theoretic Farrell-Jones Conjecture for braid groups
  

WS2011-2012

• 31 January 2012
  TILMAN BAUER (Amsterdam): Unstable cohomology operations and formal plethories
  
• 24 January 2012
  ALEXANDER HEß (Bonn): Factorable groups, homology, and applications to generalized Thompson groups
  
• 17 January 2012
  LENNART MEIER (Bonn): Module spectra over real K-theory and TMF
  
• 10 January 2012
  MARTIN LANGER (Bonn): On the cohomology of certain crystallographic groups
  
• 13 December 2011
  NOE BARCENAS (Bonn): Stable cohomotopy and an observation in analysis
  
• 6 December 2011
  MARTIN FLUCH (Bielefeld): Classifying spaces with virtually cyclic stabilisers for certain infinite cyclic extensions
  
• 29 November 2011
  RUI REIS (Bonn): Manifold calculus and Vassiliev's h-principle
  
• 22 November 2011
  PATRICK DEHORNOY (Caen): News from Garside theory
  Abstract
  
• 15 November 2011
  BIRGIT RICHTER (Hamburg): Determinants and higher divided powers
  
• 8 November 2011
  DAVID ROSENTHAL (St. John's University): Coarse Structures on Groups
  
• 25 October 2011
  MICHAEL JOACHIM (Münster): On the Gromov-Lawson-Rosenberg Conjecture for specific finite groups
  
• 18 October 2011
  IRAKLI PATCHKORIA (Bonn): On the algebraic classification of module spectra
  
• 11 October 2011
  WILLIAM G. DWYER (Notre Dame, MPI): Bockstein Algebras
  Abstract
  

SS2011

• 12 July 2011
  XIN LI (MÜNSTER): K-theory for C*-algebras attached to rings, groups and semigroups
  
• 5 July 2011
  DAVID GEPNER (Regensburg): Multiplicative transformations of additive invariants and the uniqueness of the cyclotomic trace
  
• 28 June 2011
  HARRY ULLMAN (Sheffield): The equivariant stable homotopy theory of isometries
  
• 21 June 2011
  THOMAS M. FIORE (University of Michigan-Dearborn, MPIM): Euler Characteristics of Categories and Homotopy Colimits
  Abstract
  
• 31 May 2011
  NILES JOHNSON (University of Georgia, MPIM): Homotopical Brauer Groups
  
• 24 May 2011
  QAYUM KHAN (Notre Dame): Involutions on tori with isolated fixed points
  Abstract
  
• 17 May 2011
  DIARMUID CROWLEY (HIM Bonn): Some new calculations for the Gromoll filtration
  Abstract
  
• 10 May 2011
  ANDY BAKER (Glasgow): Loop spaces with polynomial cohomology
  
• 3 May 2011
  GEORGIOS RAPTIS (Osnabrück): Derivator K-Theory
  
• 26 April 2011
  JOHANNES EBERT (Bonn): The h-principle for spaces of long manifolds, K-homology and the Atiyah-Singer Index formula
  
• 19 April 2011
  CLARA LÖH (Regensburg): Functorial semi-norms on singular homology and (in)flexible manifolds
  
• 12 April 2011
  JUSTIN NOEL (MPIM Bonn): \pi_*^C HZ: some elementary computations in equivariant (Bredon) homology and cohomology
  

WS2010-2011

• 25 January 2011
  ARKADIY SKOPENKOV (Moscow State University and the Independent University of Moscow): The classification of embeddings below the metastable dimension
  
• 18 January 2011
  VESNA STOJANOSKA (Northwestern): Duality and topological modular forms
  
• 11 January 2011
  PAVLE BLAGOJEVIC (Belgrad): From Grünbaum mass partition problems to the equivariant stable topology
  
• 14 December 2010
  WOLFGANG STEIMLE (Bonn): Obstructions to stably fibering manifolds
  
• 7 December 2010
  WOLFGANG LÜCK (Bonn): Constructing infinite, finitely generated, residually finite torsion groups with positive first L^2-Betti number
  
• 30 November 2010
  CHRISTIAN WEGNER (Bonn): The K-theoretic Farrell-Jones conjecture for CAT(0)-groups
  
• 23 November 2010
  CHRISTIAN KASSEL (Strasbourg): A cohomological invariant for groups coming from quantum group theory
  
• 16 November 2010
  TIBOR MACKO (Bonn): The additivity of the rho-invariant and periodicity in topological surgery
  
• 9 November 2010
  BRUNO VALLETTE (Université de Nice, MPIM): Homotopy Batalin-Vilkovisky algebras
  
• 2 November 2010
  MARTIN STOLZ (Bergen): Equivariant structures for smash powers
  
• 26 October 2010
  MARTIN LANGER (Bonn): Dyer-Lashof operations in Tate cohomology of finite groups
  
• 12 October 2010
  ANDREW RANICKI (Edinburgh, MPIM): Aspects of quadratic forms in the work of Hirzebruch and Atiyah – the director's cut
  

SS2010

• 20 July 2010
  CONSTANZE ROITZHEIM (Glasgow): Monoidality of Exotic Models
  
• 13 July 2010
  JOHN HARPER (Lausanne): On a Whitehead theorem for topological Quillen homology of algebras and modules over operads
  
• 6 July 2010
  JOHN KLEIN (Wayne State): Smoothing Theory Revisited
  
• 29 June 2010
  STEFAN GILLE (LMU München, Bonn): Chow motives and Rost nilpotence
  
• 22 June 2010
  HANS-WERNER HENN (Strasbourg): The rational homotopy of the K(2)-local sphere and the chromatic splitting conjecture for the prime 3 and level 2
  
• 15 June 2010
  CRAIG WESTERLAND (Melbourne): The stable topology of moduli spaces of principal bundles
  
• 8 June 2010
  LIONEL SCHWARTZ (Paris): A formula of G. Andrews and stable homotopy theory
  
• 1 June 2010
  CHRISTIAN SCHLICHTKRULL (Bergen): Higher topological Hochschild homology of Thom spectra
  
• 18 May 2010
  BERNHARD HANKE (TU München): Große und kleine Gruppenhomologie
  
• 11 May 2010
  MIA DOLLERUP (Aarhus, Bonn): Topological K-theory of the free loop space of a projective space
  
• 4 May 2010
  STEFFEN SAGAVE (Bonn): Group completion of structured diagram spaces
  
• 27 April 2010
  SØREN BOLDSEN (Bonn): Improved homological stability for mapping class groups
  
• 20 April 2010
  DON STANLEY (Regina, MPIM): Complete invariants of t-structures
  
• 13 April 2010
  MICHAEL EISERMANN (Stuttgart): Invarianten endlichen Typs von Knoten und Flächen im Raum
  

WS2009-2010

• 2 February 2010
  MARTIN OLBERMANN (MPIM): Involutions with half-dimensional fixed point set (in particular on S^6)
  
• 26 January 2010
  RALPH COHEN (Stanford): String topology, field theories and Hochschild homology.
  
• 19 January 2010
  DAVID AYALA (Copenhagen): Geometric cobordism categories.
  
• 15 December 2009
  JUSTIN NOEL (Strasbourg): The chromatic filtration and rigidifying E-infinity structures up to homotopy.
  
• 8 December 2009
  TEIMURAZ PIRASHVILI (Leicester, MPIM): Hochschild cohomology and triangulated categories.
  
• 1 December 2009
  BENOIT FRESSE (Lille): Modules over operads, iterated bar complexes and homology theories.
  
• 17 November 2009
  MATTHIAS WENDT (Freiburg): A¹-Homotopy Theory and Algebraic Groups.
  
• 10 November 2009
  WOLFGANG LÜCK (Münster): Introduction to and new results about the Farrell-Jones Conjecture.
  
• 3 November 2009
  DIERK SCHLEICHER (Jacobs-University Bremen): A question of Euler and a generalization of a Theorem of Thurston concerning iterations of transcendental maps.
  
• 27 October 2009
  STEFFEN SAGAVE (Bonn): Algebraic K-theory of logarithmic S-algebras.
  
• 20 October 2009
  KONRAD WALDORF (Berkeley, MPIM): Multiplicative Gerbes and Chern-Simons Theory.
  
• 13 October 2009
  TAKUYA SAKASAI (Tokyo Institute of Technology): Lagrangian mapping class groups from group homological point of view.
  

SS2009

• 21 July 2009,
  STEFAN BAUER (Bielefeld): Eigentliche Abbildungen zwischen Fréchet-Räumen.
  
• 14 July 2009,
  PETER TEICHNER (University of California, MPIM Bonn): Field theory and cohomology.
  
• 7 July 2009,
  JEFFREY GIANSIRACUSA (Oxford): Framed 2-discs, formality, and handlebodies.
  
• 30 June 2009,
  JOHN R. KLEIN (Wayne State University): Periodicity and duality.
  
• 23 June 2009,
  RICK JARDINE (University of Western Ontario): Pointed torsors and Galois groups.
  
• 16 June 2009,
  RAINER VOGT (Osnabrück): The classifying space functor as a derived left adjoint and applications.
  
• 26 May 2009,
  GERALD GAUDENS (Bonn): Structural properties of the cohomology of spaces.
  
• 19 May 2009,
  MATTHIAS KRECK (HIM Bonn): Exotic spheres and the Kervaire invariant.
  
• 12 May 2009,
  OSCAR RANDAL-WILLIAMS (Oxford): Monoids of moduli spaces of manifolds.
  
• 5 May 2009,
  MARKUS BANAGL (Heidelberg): Singuläre Räume, Poincaré-Komplexe und Stringtheorie.
  
• 21 April 2009,
  JÉRÔME SCHERER (UA Barcelona/MPIM): Model approximations and homological algebra.
  
• 14 April 2009,
  IAN HAMBLETON (McMaster, MPIM): The surgery assembly map and KO-homology.
  

WS2008-2009

• 3 February 2009,
  HAAKON BERGSAKER (Oslo): The multiplicative structure of the topological cyclic homology of the sphere spectrum.
  
• 27 January 2009,
  ARNE WEINER (Bonn): Morita theory of stable model categories via naive ring spectra.
  
• 20 January 2009,
  ANDRES ANGEL (Bonn): Cobordism of orbifolds.
  
• 13 January 2009,
  ERIK PEDERSEN (Copenhagen): Assembly maps.
  
• 6 January 2009,
  HANNO VON BODECKER (Bochum): On the f-invariant - an index theoretical approach.
  
• 16 December 2008,
  ULRICH BUNKE (Regensburg): Axiomatics and uniqueness for smooth cohomology theories.
  
• 9 December 2008,
  BRITA NUCINKIS (Southampton): Cohomological finiteness conditions in soluble groups.
  
• 2 December 2008,
  CHRISTOPHE CAZANAVE (Polytechnique/Paris 13): Homotopy theory of Atiyah-Hitchin schemes.
  
• 25 November 2008,
  CHRISTIAN BÄR (Potsdam): Fiber integration for Cheeger-Simons characters.
  
• 18 November 2008,
  MARCO SCHLICHTING (Baton Rouge/MPI Bonn): The Mayer-Vietoris principle for higher Grothendieck-Witt groups of schemes.
  
• 11 November 2008,
  DANIEL MÜLLNER (Bonn): Construction of chiral manifolds.
  
• 4 November 2008,
  JOHANNES EBERT (Bonn): Index theory and Madsen-Tillmann spectra.
  
• 28 October 2008,
  OLIVER BAUES (Karlsruhe/Bonn): Aspherical homogeneous manifolds.
  
• 21 October 2008,
  JOHN HARPER (Notre Dame/EPFL): Bar constructions and Quillen homology of modules over operads.
  
• 14 October 2008,
  GEREON QUICK (Münster): Etale Homotopietheorie.
  

SS2008

• 15 July 2008,
  GONCALO TABUADA (Lisboa): Higher K-theory via universal invariants.
  
• 8 July 2008,
  TAKUJI KASHIWABARA (Institut Fourier, Grenoble): K_*(Ω ^∞Σ ^∞X;Z/p) as a functor of K_*(X).
  
• 1 July 2008,
  QAYUM KHAN (Vanderbilt): The Nil-Nil theorem in algebraic K-theory.
  
• 10 June 2008,
  NIKO NAUMANN (Regensburg): Motivic Landweber exactness.
  
• 3 June 2008,
  ARKADIY SKOPENKOV (Moscow State and Independent University Moscow): Embeddings of non-simply connected 4-manifolds in 7-space.
  
• 20 May 2008,
  ARTHUR BARTELS (Münster): Topological rigidity for CAT(0)-groups.
  
• 6 May 2008,
  PASCAL LAMBRECHTS (Louvain): Rational homology of embedding spaces.
  
• 29 April 2008,
  MARKUS SPITZWECK (Regensburg): Slices of motivic Landweber spectra.
  
• 22 April 2008,
  SADOK KALLEL (Lille, MPIM): The Topology of Finite Subset Spaces.
  
• 15 April 2008,
  PAOLO SALVATORE (Roma 2 Tor Vergata): A topological version of the cyclic Deligne conjecture.
  
• 8 April 2008,
  BJØRN JAHREN (Oslo): Free topological involutions on S¹ x Sⁿ.
  

WS2007-2008

• 5 February 2008,
  MAX KAROUBI (Jussieu): Twisted K-theory, old and new.
  
• 29 January 2008,
  CHRISTIAN AUSONI (Bonn): On rational algebraic K-theory.
  
• 22 January 2008,
  JULIA SINGER (Bonn): Commutative multiplications on Moore spectra.
  
• 15 January 2008,
  DAVID ROSENTHAL (St. John's University): On the algebraic K-theory of groups with finite asymptotic dimension.
  
• 18 December 2007,
  JEAN FASEL (EPFL Lausanne): Euler classes of algebraic vector bundles.
  
• 11 December 2007,
  CLARK BARWICK (University of Oslo): Operator categories for homotopy coherent algebra.
  
• 4 December 2007,
  ANDREW RANICKI (University of Edinburgh): A composition formula for manifold structures.
  
• 27 November 2007,
  IAN HAMBLETON (McMaster University): Aspherical 2-complexes and 4-manifolds
  
• 20 November 2007,
  NAFAA CHBILI (Monastir University / MPIM Bonn): On equivariant Khovanov homology.
  
• 6 November 2007,
  TIBOR MACKO (Universität Münster): On fake lens spaces.
  
• 30 October 2007,
  CLARA LÖH (Universität Münster): Isomorphisms in l¹-homology.
  
• 23 October 2007,
  MICHAEL POLYAK (Technion, Haifa / MPIM Bonn): Lines intersecting knots and finite type knot invariants.
  
• 16 October 2007,
  GEORG BIEDERMANN (MPIM Bonn): Homotopy nilpotent groups.
  

SS2007

• 10 July 2007,
  RALPH KAUFMANN (University of Connecticut / MPIM): Graphen, Operaden und deren Algebren.
  
• 3 July 2007,
  DAVID BARNES (University of Sheffield): An Algebraic Model for Rational O(2)-Equivariant Spectra.
  
• 26 June 2007,
  STEFFEN SAGAVE (University of Oslo): Higher multiplicative structures in the homology of differential graded algebras.
  
• 19 June 2007,
  JOHANNES EBERT (University of Oxford): On the homology of the Deligne-Mumford space.
  
• 12 June 2007,
  JOACHIM GRUNEWALD (Universität Bonn): Operations on Nil-terms.
  
• 5 June 2007,
  ANDREAS HEIDER (Universität Bonn): One or two results from Morita theory of stable model categories.
  
• 22 May 2007,
  FRANÇOIS-XAVIER DEHON (Université de Nice): Unstable algebras, generalized cohomology theories, and realizability problems.
  
• 15 May 2007,
  BIRGIT RICHTER (Universität Hamburg): K-Theorie bipermutativer Kategorien und virtuelle 2-Vektorbündel.
  
• 8 May 2007,
  VOLKER PUPPE (Universität Konstanz): Involutionen auf 3-Mannigfaltigkeiten und binäre, selbstduale Codes
  
• 24 April 2007,
  GREGORY ARONE (University of Virginia, MPIM): Chain rule in calculus of functors.
  
• 17 April 2007,
  PASCAL LAMBRECHTS (Université Catholique de Louvain): The rational homology of spaces of smooth embeddings from two calculi of functors viewpoint.
  
• 10 April 2007,
  DIARMUID CROWLEY (Universität Bonn): Automorphisms of odd dimensional manifolds and l_2q+1(Z[π]).
  
• 3 April 2007,
  WOLFGANG LÜCK (Universität Münster): The Farrell-Jones Conjecture and its applications.
  

WS2006-2007

• 6 February 2007,
  GEOFFREY POWELL (Université Paris 13): The Singer functors revisited
  
• 30 January 2007,
  HOSSEIN ABBASPOUR (MPIM): String Topology, from a symplectic point of view
  
• 23 January 2007,
  CARSTEN SCHULTZ (TU Berlin): Kohomologieringe komplexer Unterraumarrangements
  
• 16 January 2007,
  MATTHIAS KRECK (Universität Bonn): Äquivariante Kohomologie und Poincaré Dualität
  
• 9 January 2007,
  HANS-WERNER HENN (Université de Strasbourg): K(2)-local homotopy theory at the prime 2
  
• 19 December 2006,
  MARKUS BANAGL (Universität Heildelberg): Jüngste Entwicklungen in der Schnitthomologie
  
• 12 December 2006,
  THOMAS M. FIORE (University of Chicago): Jacobians of Riemann Surfaces with Parametrized Boundary
  
• 5 December 2006,
  OLIVER RÖNDIGS (Universität Osnabrück): The motivic J-homomorphism
  
• 28 November 2006,
  CONSTANZE ROITZHEIM (Universität Bonn): Starrheit der K-lokalen stabilen Homotopiekategorie
  
• 21 November 2006,
  NASKO KARAMANOV (MPIM): On K(2) local homotopy theory and Hopkins Picard Group Pic_2
  
• 14 November 2006,
  AURÉLIEN DJAMENT (Université Paris 13): Grassmannsche Funktorkategorien und Krullfiltrierung
  
• 7 November 2006,
  MARTIN MARKL (Academy of Sciences of the Czech Republic): Natural differential operators and graph complexes
  
• 31 October 2006,
  JENNIFER SCHULTENS (University of California at Davis, MPIM): Stabilisierung und Amalgamation von Heegaardzerlegungen
  
• 24 October 2006,
  BEN C. WALTER (University of Purdue, MPIM): Lie coalgebras of graphs
  
  

SS2006

• 11 July 2006,
  KEIVAN MALLAHI-KARAI (Universität Bonn): Relative growth of subgroups in arithmetic groups
  
• 4 July 2006,
  JUAN WANG (Universität Bonn): An unstable splitting of the free loop space of a suspension
  
• 27 June 2006,
  GAEL COLLINET (Université de Strasbourg): On the homology of the group G₂(Z[1/2])
  
• 20 June 2006,
  JOHN R. KLEIN (Wayne State University): Strings, Poincare duality and homotopy invariance
  
• 13 June 2006,
  FRITZ GRUNEWALD (Universität Düsseldorf): Linear representations of the automorphism group of a free group and of the mapping class group
  
• 30 May 2006,
  GERD LAURES (Universität Bochum): Bordism-like theories
  
• 23 May 2006,
  BERNARDO URIBE (Universitad de los Andes): Orbifold string topology
  
• 16 May 2006,
  ANDREAS THOM (Universität Göttingen): L² Betti numbers and cohomology for von Neumann algebras
  
• 9 May 2006,
  CHRISTOPH LAMM: Dedekind-Summen und Knotentheorie
  
• 2 May 2006,
  URS SCHREIBER (Universität Hamburg): On the String 2-Group
  
• 25 April 2006,
  MIGUEL XICOTENCATL (Cinestav, Mexico - Universität Bonn): Computations and operations in orbifold string topology
  
• 18 April 2006,
  JEFFREY GIANSIRACUSA (Oxford University): Mapping class groups of 4-manifolds
  

WS2005-2006

• 7 February 2006,
  RICHARD WEIDMANN (Universität Frankfurt): Faltungen und Nielsen-Äquivalenz
  
• 31 January 2006,
  CHRISTINE VESPA (University Paris 13): The functor category Fquad associated to quadratic spaces over F₂
  
• 24 January 2006,
  IMMA GALVEZ CARILLO (London Metropolitan University): Witten genus and quasimodular forms
  
• 17 January 2006,
  TIBOR MACKO (Universität Münster): Automorphism spaces of projective spaces and lens spaces
  
• 10 January 2006,
  BENJAMIN HIMPEL (Universität Bonn) : The spectral flow of the odd signature operator coupled to a path of connections
  
• 13 December 2005,
  ANDRE HENRIQUEZ (Universität Münster): A Lie algebra for the String group
  
• 6 December 2005,
  RAINER VOGT (Universität Osnabrück): Interchange, E_n-spaces, and applications
  
• 29 November 2005,
  JOACHIM GRUNEWALD (Universität Münster): The behavior of Nil-Groups under Localization
  
• 22 November 2005,
  ARNE WEINER (Universität Bonn) : Symmetric Spectra and Morava K-theories
  
• 15 November 2005,
  MATTHIAS KÜNZER (RWTH Aachen): Heller triangulated categories
  
• 8 November 2005,
  DAVE BENSON (University of Aberdeen) : Cohomology of groups and duality
  
• 25 October 2005,
  JENS HORNBOSTEL (Universität Regensburg) : Beta-elements and divided congruences
  
• 18 October 2005,
  RYAN BUDNEY (MIPM) : Topology of spaces of knots in dimension 3
  

SS2005

• 12 July 2005,
  DAVID J. GREEN (Universität Wuppertal) : Computing cohomology rings of finite groups
  
• 5 July 2005,
  CONSTANTIN TELEMAN (University of Cambridge) : 2D Semi-simple Topological Field Theories
  
• 28 June 2005,
  MIGUEL XICOTENCATL (Cinestav, Mexico - Universität Bonn) : Orbifold String Topology
  
• 21 June 2005,
  PAUL GOERSS (Northwestern University) : Filtrations of the moduli space of formal groups and the stable homotopy groups of spheres
  
• 7 June 2005,
  ROLAND FRIEDRICH (MPIM, Bonn) : From moduli spaces of Riemann surfaces to random paths
  
• 31 May 2005,
  GEORG BIEDERMANN (University of Western Ontario) : Homotopy theory of functors
  
• 24 May 2005,
  TEIMURAZ PIRASHVILI (Razmadze Mathematical Institute / Bielefeld / MPIM Bonn) : Comparison between Hochschild, Shukla and MacLane cohomology
  
• 10 May 2005,
  HANS-WERNER HENN (Université Strasbourg, MPIM) : Picard groups in K(1)-local and K(2)-local homotopy theory
  
• 3 May 2005,
  DAVID CHATAUR (Université de Lille 1) : On a mod-p analogue of the Bousfield-Peterson-Smith spectral sequence
  
• 26 April 2005,
  NORA GANTER (Uni. of Illinois at Urbana-Champaign) : Orbifold Geschlechter und K(n)-lokale Spektren
  
• 19 April 2005,
  FERNANDO MURO (MPIM Bonn) : The localization theorem in cohomology of categories
  
• 12 April 2005,
  JEAN-PHILIPPE JOURDAN (Université de Lille 1) : Homotopy invariance of configuration spaces
  
• 29 March 2005,
  MARK BEHRENS (MIT) : Buildings, Elliptic curves, and the stable homotopy groups of spheres
  

WS2004-2005

• 9. February 2005
  FERIT DENIZ (Universität Köln) : Lie Gruppen vom topologischen Standpunkt
  
• 1. February 2005
  FRIDOLIN ROTH (Universität Bonn) : Lusternik-Schnirelman-Category and Euclidean configuration spaces
  
• 24. January 2005
  ELKE MARKERT (Notre Dame) : Ein Spektrum für ko aus euklidischen Quantum Feldtheorien
  
• 18. January 2005
  MARTIN LANGER (Universität Bonn) : Realizability of modules over Tate cohomology
  
• 11. January 2005
  THOMAS BARTSCH (Universität Giessen) : Konfigurationsräume, Transfer, und Lösungen nichtlinearer partieller Differentialgleichungen
  
• 21. December 2004
  BALAZS VISY (Universität Bonn) : Graph complexes
  
• 14. December 2004
  MARCO SCHMIDT (Universität Münster) : Simplicial Volume and L²-Betti Numbers
  
• 7. December 2004
  DMITRI PANOV (MPIM Bonn) : Polyhedral Kaehler Manifolds
  
• 30. November 2004
  MARTIN LUSTIG (Université d'Aix-Marseille III/MPIM Bonn) : Teichmüller-Geodätische im Culler-Vogtmann-Raum via Faltungen von train tracks
  
• 23. November 2004
  BJÖRN SCHUSTER (Universität Wuppertal) : Morava K-theory of classifying spaces
  
• 16. November 2004
  HENNING KRAUSE (Universität Padderborn) : Smashing localizations and the algebraic telescope conjecture
  
• 9. November 2004
  ERWANN LANNEAU (MPIM Bonn) : Moduli spaces of quadratic differentials
  
• 2. November 2004
  MARKUS SZYMIK (Universität Bochum) : Symmetries of 4-manifolds
  
• 26. October 2004
  OLIVER ROENDIGS (Universität Bielefeld) : Modules over motivic cohomology
  
• 19. October 2004
  SEMEN SADETOV (Don State Technical University) : The symplectic structure of Beresin-Kirillov-Kostant-Souriau on the orbits of the coadjoint representation is the differntial of a rational 1-form
  
• 12. October 2004
  DAN BURGHELEA (Ohio-State/MPIM Bonn) : An invariant for non simply connected manifolds
  

SS2004

• 27. Juli 2004
  FRANÇOIS-XAVIER DEHON (Nice): Cohomology of mapping spaces and division functors : an overview
  
• 20. Juli 2004
  MICHAEL FARBER (Durham/MPI): Topology of configuration spaces and problems of robotics
  
• 13. Juli 2004
  WALTER NEUMANN: 3-Manifolds and singularities of splice type
  
• 6. Juli 2004
  CHRISTINE LESCOP (UJF Grenoble): Vassiliev invariants and Chern-Simons-Theory
  
• 29. Juni 2004
  JOCHEN ABHAU (Bonn): Berechnungen der Homologie von Abbildungsklassengruppen und Modulräumen Riemmannscher Flächen
  
• 15. Juni 2004
  ALEXANDER NENASHEV (Bielefeld): On the Witt groups of projective bundles: geometric reasoning
  
• 8. Juni 2004
  GEORG BIEDERMANN (Bonn): Interpolation categories of homology theories
  
• 25. May 2004
  BERNARDO URIBE (U. Michigan/z.ZT. MPI): Differential characters on orbifolds and string connections
  
• 18. May 2004
  MAMUKA JIBLADZE (MPI Bonn): Secondary derived functors and the E₃ term of the Adams spectral sequence
  
• 11. May 2004
  JOHN ROGNES (Oslo): A homological approach to topological cyclic theory
  
• 4. May 2004
  CARL-FRIEDRICH BÖDIGHEIMER (Bonn): Goodwillie derivative of the identity functor
  
• 27. April 2004
  OTMAR VENJAKOB (Heidelberg): Charakteristische Elemente in nicht-kommutativer Iwasawa-Theorie
  

WS2003-2004

• 3. February 2004
  JAN SCHRÖER (Leeds): Irreduzible Komponenten von Modulvarietäten
  
• 27. January 2004
  STEFFEN SAGAVE (Bonn): Algebraische K-Theorie von Modellkategorien
  
• 20. January 2004
  GUNTHER KRAUSS (Bonn): Symmetrische Produkte von lokalen Koeffizientensystemen
  
• 13. January 2004
  BENOIT FRESSE (Lille): The bar construction of an E-infinity algebra
  
• 16. December 2003
  JULIA SINGER (Münster): Analogien zwischen Knotentheorie und Iwasawatheorie
  
• 9. December 2003
  LUC MENICHI (Angers): Batalin-Vilkovisky algebras and cyclic cohomology of Hopf algebras
  
• 2. December 2003
  JOHANNES EBERT (Bonn): On the moduli space of abelian differentials
  
• 25. November 2003
  FRANK HERRLICH (Karlsruhe): Origamikurven in Modulräumen
  
• 18. November 2003
  SADOK KALLEL (Lille): Rational maps, Configurations and String Topology
  
• 11. November 2003
  C. B. THOMAS (Cambridge/MPI): Contact structures on Fake Lens Spaces
  
• 4. November 2003
  GERALD GAUDENS (Bonn): Results on N. Kuhn's realization conjectures
  
• 28. October 2003
  MICHAEL JOACHIM (Bonn): On the Gromov-Lawson-Rosenberg Conjecture for (Z/2)^2
  
• 21. October 2003
  TORSTEN LANGER: Das Pontrjagin-Produkt in der Homologie des Abbildungsraumes vom Torus in die 3-Sphäre