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Holger Kammeyer

Dr. Holger Kammeyer

Office Hours: nach Vereinbarung
Room: 1.007
Phone: +49 (0) 721 608-43707
Fax: +49 (0) 721 608-42148
holger kammeyerHuu9∂kit edu

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 and L²-invariants in geometry and group theory. 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

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

Lecture notes
Title Publisher Year

Title Coauthors Year

Caterina Campagnolo



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.

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 


Conference: Arithmetic groups and 3-manifolds

Conference: Arithmetic groups and 3-manifolds

University of Hagen


Hagen, Germany


March, 23rd - 27th, 2020


Workshop "New directions in L2-invariants"

Workshop "New directions in L2-invariants"

Hausdorff Research Institute for Mathematics 




10/04 - 10/07/2016


Junior Trimester Program "Topology"

Junior Trimester Program "Topology"

Working group "L2-Invariants" Joint with G. Herrmann, A. Kar, S. Kionke und J. Raimbault.  


Hausdorff Research Institute for Mathematics, Bonn

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

Past teaching

Former teaching in Göttingen
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