is not

  • Kai-Uwe Bux

    Universität Bielefeld, Germany
  • Amir Mohammadi

    The University of Texas at Austin, USA
  • Kevin Wortman

    University of Utah, Salt Lake City, USA


We prove the result from the title using the geometry of Euclidean buildings.

Cite this article

Kai-Uwe Bux, Amir Mohammadi, Kevin Wortman, is not . Comment. Math. Helv. 85 (2010), no. 1, pp. 151–164

DOI 10.4171/CMH/191