Journal of Topology Advance Access published online on October 25, 2007
Journal of Topology, doi:10.1112/jtopol/jtm007
© 2007 London Mathematical Society
The tower of K-theory of truncated polynomial algebras
Lars Hesselholt, Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA, larsh{at}math.mit.edu
Graduate School of Mathematics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan, larsh{at}math.nagoya-u.ac.jp
Let A be a regular noetherian
p-algebra. The relative K-groups Kq(A[x]/(xm),(x)) and the Nil-groups Nilq(A[x]/(xm)) were evaluated by the author and Ib Madsen in terms of the big de Rham–Witt groups
r
Aq of the ring A. In this paper, we evaluate the maps of relative K-groups and Nil-groups induced by the canonical projection f: A[x]/(xm)
A[x]/(xn). The result depends strongly on the prime p. It generalizes earlier work by Stienstra on the groups in degrees 2 and 3.
Received February 28, 2007.
2000 Mathematics Subject Classification 19D55 (primary), 19E15 (secondary)
Research supported in part by the National Science Foundation.
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