Kai Köhler's Home Page

Sommer 2023:
Vorlesung "Funktionentheorie" (Bachelor)
Proseminar "Differentialtopologie" (Bachelor)
Winter 2022/23:
Vorlesung "Analysis III" (Bachelor)
Proseminar "Das BUCH der Beweise" (Bachelor)


Publications & preprints.
Contact me at koehler@math.uni-duesseldorf.de. If you like, use my PGP Public Keys.

Snail mail:
Mathematisches Institut
Universitätsstr. 1
Gebäude 25.22
D-40225 Düsseldorf
Phone: +49(211)81-12191

My office is



Did you always admire those chic german letters used for Lie algebras without being able to reproduce them on the blackboard? Have you always been afraid to ask how to draw them, thus scrawling fantasy letters instead? Fear no longer!

Mathematical Societies

DMV | EMS | AMS | IMU - International Mathematical Union

Zum Schmökern

Non-reviewed sources and preprints:


Index journals to reviewed papers:

Zentralblatt recherche 1868-now (open access).
MathSciNet recherche (1940-now). (In contrast to the Zentralblatt, MathSciNet is unable to deal with non-english characters. To search a name containing these, try to guess how a typical american immigration officer would spell the name. Still you usually won't get all reviewed articles of that person displayed; click on the author's name to get more.)
Electronic Mathematical Journals and those which are accessible in Duesseldorf.

Freely available reviewed publications:

Mostly scanned older articles from print journals:
Goettinger Digitalisierungszentrum (german journals)
NUMDAM (french journals)

Other institutes

Mathematisches Institut der Universität Bonn (and its weekly program )
Mathematisches Institut der Universität zu Köln
Max-Planck-Institut für Mathematik (MPIM)
Mathematisches Forschungsinstitut Oberwolfach (MFO)
MIT Department of Mathematics
Mathematical Sciences Research Institute (MSRI)
Centre International de Rencontres Mathématiques (CIRM)
Centre de Recerca Matemàtica (CRM)

Publishing companies

Oxford University Press, de Gruyter, Cambridge Univ. Press, Springer and Princeton University Press.

Verzeichnis antiquarischer und neuer Bücher.


CMI Millennium Prize Problems

Video archive of mathematical lectures at MSRI

Mathematics Genealogy Project
Determine your Erdös Number (mine is 4)
(last name, first name MathSciNet style).
and don't miss the statistics on collaboration in mathematics there.

Other links


c't | Nachrichten der deutschen Welle

Science news

Austria Presse Agentur | wissenschaft-online| New Scientist

Search the movie database for

Kino in Düsseldorf

Public Library Düsseldorf

Railway timetables in Europe by the german railway.

White and yellow pages in France and Germany.

Verkehrsverbund Rhein-Ruhr

Search Engine


The Weather

Weather forecast Düsseldorf, Solingen, Radarbild von NRW.

First created October 1995

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