Ivo Dell'Ambrogio and Jean Fasel: The Witt groups of the spheres away from two

ambrogio@math.ethz.ch, jfasel@math.ethz.ch

Submission: 2006, Feb 13, revised: 2006, May 29

By simple geometric methods, we calculate the Balmer-Witt groups of the spheres (over a base ring with 2 invertible) up to 2-primary torsion and determine the multiplicative structure of the total graded Witt group. An appendix clarifies an issue concerning the canonicity of coherent Witt groups and transfer morphisms.

2000 Mathematics Subject Classification:

Keywords and Phrases:

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