Steffen Sagave

portrait

I am Postdoc ("Akademischer Rat auf Zeit") in the Topology Group. Before that, I was a Postdoc in Wolfgang Lück's topology group in Münster and in John Rognes' Brave new rings project in Oslo.

My research interests include the areas of stable homotopy theory, algebraic K-theory, and homological algebra.

Contact

Postal address: Steffen Sagave, Mathematisches Institut, Universität Bonn, Endenicher Allee 60, 53115 Bonn, Germany
Office: Room 4.009
Phone: +49 228 73-62255
Fax: +49 228 73-6198

email address


Teaching / Lehre

Sommersemester 2012
Seminar S1G1 "Elementare Zahlentheorie"
(zusammen mit Martin Langer)

Graduate Seminar Advanced Topology S4D4 "Model Categories"
(zusammen mit Wolfgang Steimle)

Graduate Seminar Topology S4D2 "Selected papers in homotopy theory"
(zusammen mit Stefan Schwede)

Begleitseminar zu den Bachelorarbeiten in der Topologie (Vortragsliste)
(zusammen mit Carl-Friedrich Bödigheimer, Tibor Macko und Stefan Schwede)

Earlier Teaching / Lehre vergangener Semester


Preprints

Spectra of units for periodic ring spectra
arXiv:1111.6731, pdf-file

Group completion and units in I-spaces
(joint with Christian Schlichtkrull)
arXiv:1111.6413, pdf-file

Diagram spaces and symmetric spectra
(joint with Christian Schlichtkrull)
arXiv:1103.2764, pdf-file


Publications

DG-algebras and derived A-infinity algebras
Journal für die reine und angewandte Mathematik (Crelle's Journal), 639 (2010), 73-105.
arXiv:0711.4499, pdf-file, published article

Universal Toda brackets of ring spectra
Transactions of the American Mathematical Society, 360 (2008), no. 5, 2767-2808.
arXiv:math/0611808, pdf-file, published article

On the algebraic K-theory of model categories
Journal of Pure and Applied Algebra, 190 (2004), no. 1-3, 329-340.
pdf-file, published article


Notes from talks

Spectra of units for periodic ring spectra
Talk at the Oberwolfach Workshop Homotopy Theory, September 2011
Extended abstract: pdf-file

Logarithmic structures in homotopy theory
Talk at the Conference on Current trends in logarithmic geometry, Bordeaux, June 2010
Presentation: pdf-file for screen, pdf-file for printing

Graded log symmetric ring spectra
Talk at the Conference on p-Adic Geometry and Homotopy Theory, Loen, August 2009
Presentation: pdf-file for screen, pdf-file for printing

DG-algebras and derived A-infinity algebras
Talk at the Banff workshop New Topological Contexts for Galois Theory and Algebraic Geometry, March 2008
Presentation: pdf-file for screen, pdf-file for printing

DG-algebras and derived A-infinity algebras
Talk at the Algebra Seminar at the Institut Henri Poincaré, Paris, January 2008
Slides: pdf-file