Department of Mathematics | Institute for Algebra and Geometry | Topology
Holger Kammeyer

Dr. Holger Kammeyer

  • Karlsruher Institut für Technologie
    MATH | IAG | AG Topologie
    Englerstr. 2 | Mathebau (20.30)
    76131 Karlsruhe

 I am a postdoc in the topology group of the Institute for Algebra and Geometry at KIT. My mathematical interests range around algebraic topology, ℓ²-invariants and arithmetic groups. I am member of the Priority Program 2026 "Geometry at Infinity" and of the RTG 2229 "Asymptotic Invariants and Limits of Groups and Spaces". Here you can find slides of a talk on "The construction of the regular 65.537-gon with compass and straightedge" at the Day of Mathematics 2019 (in German).

Introduction to ℓ²-invariants

An up-to-date and user-friendly introduction to the rapidly developing field of ℓ ²-invariants.

Springer Lectue Notes in Mathematics, Vol. 2247

Introduction to l2-invariants Springer 2019
Title Coauthors Journal

Steffen Kionke, Jean Raimbault, Roman Sauer

to appear in Forum of Mathematics, Sigma

to appear in Acta Arithmetica

Roman Sauer

to appear in Groups, Geometry, and Dynamics.


Springer Lecture Notes in Mathematics, Vol. 2247, viii+181 pp. ISBN: 978-3-030-28296-7

Bull. Lond. Math. Soc.,

49-3 (2017), 428–442

Groups, Geometry, and Dynamics,

11-4 (2017), 1231–1251 

Wolfgang Lück, Henrik Rüping

Geometry & Topology,
20-3 (2016), 1275--1287

Algebraic & Geometric Topology,

14 (2014), 2475-2509

Journal of Lie Theory,

24, No. 2 (2014), 307-319 

Survey articles and publications in quantitative finance
Title Coauthors Journal

Roman Sauer

to appear in Oberwolfach Snapshots of Modern Mathematics

Jörg Kienitz

Wilmott Magazine, Issues 57, 58, 59, (Jan 2012, March 2012, May 2012), 46-53, 34-45, 44-49

Title Type, University

doctoral thesis, University of Göttingen

diploma thesis, University of Göttingen 


Summer term 2020

Winter term 2019/2020

RG-Seminar "Topology" Thu 03:45-05:15 pm, SR 2.059 (20.30)

Summer term 2019

Winter term 2018/2019

Summer term 2018

Winter term 2017/2018

Summer term 2017

Winter term 2016/2017

No teaching due to scientific stay in Bonn. 

Summer term 2016

More Information on the lecture "Algebraic Topology" is given in the course announcement.

Winter term 2015/2016

More information on the lecture "L²-invariants" is given in the course announcement.

Summer term 2015

Since April 2015 Postdoc at Institute for Algebra and Geometry
(working with Roman Sauer)
Karlsruhe Institute of Technology
July 2013 - March 2015 Postdoc at Mathematical Institute
(working with Wolfgang Lück)
University of Bonn
July 2010 - May 2013 Doctoral studies at Mathematical Institute
(working with Thomas Schick)
University of Göttingen
August 2009 - June 2010 Fulbright scholar at Department of Mathematics University of California Berkeley
July 2008 - October 2008 Internship in team "Quantitative Analysis" Deutsche Postbank, Bonn
October 2004 - July 2009 Diploma studies in mathematics with minor theoretical physics University of Göttingen