Talks

Research talks
Oct 26, 2012A calculus of fractions for the homotopy category of a Brown cofibration category
Jul 05, 2012On the triangulated structure of homotopy categories
  • Young Topologists Meeting 2012, conference, organised by Daniela Egas, Casper Guldberg, Angela Klamt, Anssi Lahtinen, Toke Nørgård-Sørensen, Centre for Symmetry and Deformation, University of Copenhagen, Denmark.
  • homepage, beamer slides (print version), thesis
Feb 15, 2012A calculus of fractions for homotopy categories
  • Groupe de travail Algèbre et Topologie Homotopiques, seminar, organised by Georges Maltsiniotis, Bernhard Keller, Université Paris Diderot - Paris VII, France.
  • homepage, overhead slides, thesis
Oct 12, 2011Ein Bruchkalkül für Homotopiekategorien (A calculus of fractions for homotopy categories)
  • Kolloquium des Graduiertenkollegs “Experimentelle und konstruktive Algebra” (Colloquium of the research training group “Experimental and constructive algebra”), colloquium, organised by Gabriele Nebe and myself, RWTH Aachen University.
  • homepage, overhead slides (in German), thesis
Jun 16, 2011A construction of the homotopy category of a Brown cofibration category
  • Young Topologists' Meeting 2011, conference, organised by Eric Finster, Varvara Karpova, Marc Stephan, École polytechnique fédérale de Lausanne, Switzerland.
  • homepage, overhead slides, thesis
May 17, 2011On the second cohomology group of a simplicial group
  • Algebra – Darstellungstheorie – Homologische Methoden (Algebra – representation theory – homological methods), seminar, organised by Steffen König, Universität Stuttgart.
  • homepage, overhead slides, article
May 29, 2009On the second cohomology group of a simplicial group
  • Young Topologists' Meeting 2009, conference, organised by Patrick Müller, Le Châtelard, Switzerland.
  • homepage, article
Feb 5, 2009Über die zweite Kohomologiegruppe verschränkter Moduln (On the second cohomology group of a crossed module)
  • Oberseminar Algebra der Lehrstühle A und D für Mathematik (Seminar algebra of chairs A and D in mathematics), seminar, organised by Julia Hartmann and Gabriele Nebe, RWTH Aachen University.
  • article
Nov 26, 2008Fractionable categories
  • K-Theorie, Motivische Kohomologie und Algebraische Homotopietheorie (K-theory, motivic cohomology and algebraic homotopy theory), graduate and doctoral student seminar, organised by Markus Rost, Universität Bielefeld.
  • article
Sep 15, 2008(Ko)homologie verschränkter Moduln ((Co)homology of crossed modules)
  • Studierendenkonferenz zur Jahrestagung der Deutschen Mathematiker-Vereinigung 2008 (Student section of the annual conference of the German Mathematical Society 2008), conference, organised by Andreas Gastel, Friedrich-Alexander Universität Erlangen-Nürnberg.
  • homepage
Jul 10, 2008(Ko)homologie verschränkter Moduln ((Co)homology of crossed modules)
  • Doctoral student seminar of Graduiertenkolleg 1150 Homotopy and Cohomology, doctoral student seminar, Heinrich-Heine-Universität Düsseldorf.
May 28, 2008(Co)homology of crossed modules.
  • Young Topologists' Meeting 2008, conference, organised by Patrick Müller, Le Châtelard, Switzerland.
Feb 7, 2008(Ko)homologie verschränkter Moduln ((Co)homology of crossed modules)
  • Rheinische Friedrich-Wilhelms-Universität Bonn.
Jan 4, 2008(Ko)homologie verschränkter Moduln ((Co)homology of crossed modules)
  • RWTH Aachen University.
Dec 3, 2007Homologie verschränkter Moduln (Homology of crossed modules)
  • Oberseminar über Geometrie und Algebra (seminar on geometry and algebra), seminar, organised by Rudolf Scharlau, Technische Universität Dortmund.
  • homepage
Seminar talks
Dec 14 & Dec 17, 2012 Quillen-Modellkategorien (Quillen model categories)
  • Oberseminar Schnitttheorie II (Seminar intersection theory), seminar, organised by Mohamed Barakat, RWTH Aachen University.
  • homepage
Nov 28 & Dec 5 & Dec 12, 2012 Derivierte Funktoren auf der derivierten Kategorie (Derived functors on the derived category)
  • Oberseminar Darstellungstheorie: Deligne-Lusztig-Theorie (Seminar representation theory: Deligne-Lusztig theory), seminar, organised by Gerhard Hiß, RWTH Aachen University.
  • notes (in German)
Jun 1 & Jun 29 & Jul 6 & Jul 13, 2011 Einführung in die kategorielle und homologische Algebra (Introduction to categorical and homological algebra)
  • Oberseminar Darstellungstheorie: Die Broué-Vermutung für symmetrische Gruppen (Seminar representation theory: the Broué conjecture for symmetric groups), seminar, organised by Gerhard Hiß, RWTH Aachen University.
  • notes (in German), handout (in German)
Oct 23, 2008Introduction to model categories
  • Doctoral student seminar of Graduiertenkolleg 1150 Homotopy and Cohomology: K-theory and derived equivalences, doctoral student seminar, organised by Mark Ullmann, Rheinische Friedrich-Wilhelms-Universität Bonn.
  • program
Jul 14, 2008Axiomatische Mengenlehre mit Grothendieck-Universen (Axiomatic set theory with Grothendieck universes)
  • RWTH Aachen University.
Dec 1 & Dec 8 & Dec 15, 2006Die Cohen-Macaulay-Eigenschaft von Invariantenringen endlicher Matrixgruppen (The Cohen-Macaulay property of invariant rings of finite matrix groups)
  • Seminar Darstellungstheorie: Invariantentheorie (Seminar representation theory: invariant theory), student seminar, organised by Gabriele Nebe, RWTH Aachen University.
  • homepage, notes (in German), overhead slides (in German)
Jul 18, 2006Homologische Dimensionsbegriffe (Homological notions of dimensions)
  • Seminar Kommutative Algebra: Weiterführende Themen und Anwendungen (Seminar commutative algebra: further topics and applications), student seminar, organised by Eva Zerz, RWTH Aachen University.
  • notes (in German), handout (in German), overhead slides (in German)
Nov 30, 2005Der K├Ârper der elliptischen Funktionen (The field of elliptic functions)
  • Seminar Funktionentheorie: Elliptische Funktionen und elliptische Kurven (Seminar complex analysis: elliptic functions and elliptic curves), student seminar, organised by Aloys Krieg, RWTH Aachen University.
  • homepage, notes (in German), handout (in German), overhead slides (in German)
Jun 21, 2005(with Stephan Schmitz) Das abstrakte Cauchy-Problem (The abstract Cauchy problem)
  • Seminar Funktionalanalysis: Halbgruppen (Seminar functional analysis: semigroups), student seminar, organised by Volker Enß, RWTH Aachen University.
  • notes (in German), overhead slides (in German)
Apr 12, 2005(with Stephan Schmitz) Definition der Halbgruppen und ihrer Erzeuger, Norm-stetiger und stark stetiger Fall (Definition of semigroups and their generators, norm continuous and strong continuous case)
  • Seminar Funktionalanalysis: Halbgruppen (Seminar functional analysis: semigroups), student seminar, organised by Volker Enß, RWTH Aachen University.
  • notes (in German), overhead slides (in German)
Jan 10, 2005Die Algebra der Modulformen (The algebra of modular forms)
  • Seminar Algebra: Gitter und Codes (Seminar algebra: lattices and codes), student seminar, organised by Gerhard Hiß, RWTH Aachen University.
  • notes (in German)
Jan 13, 2004Eine transitive Gruppenoperation auf den primitiven Pythagoreischen Zahlentripeln (A transitive group action on the primitive Pythagorean triples)
  • Elementare Zahlentheorie (Elementary number theory), lecture, lectured by Ulrich Schoenwaelder, RWTH Aachen University.
  • homepage

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