The book Polytopes, rings, and K-theory has appeared. You can download preface, table of contents, and bibliography and corrections and additions.

Version 2.1 of Normaliz was uploaded on February 06, 2009. It improves the old version in almost every respect. As before, it includes a Singular interface, and a Macaulay2 interface has now been added.

My programs for experiments in toric geometry and lattice polytopes are now free software under GPL.

Corrections to the revised edition of Cohen-Macaulay rings are available here.

Determinantal rings (Springer Lecture Notes in Mathematics 1327) is available as a PDF file (with permission of Springer-Verlag). It has also been republished by Springer.

I have started to make computer presentations of conference talks available.

Editorial offices:

Homotopy, Homology and Applications
Osnabrücker Studien zur Mathematik
International Journal of Modern Mathematics

Please consult Research groups for a description of recent research activities (in German).