On the structure of Witt-Burnside rings attached to pro-p groups

Details On the structure of Witt-Burnside rings attached to pro-p groups On the structure of Witt-Burnside rings attached to pro-p groups

2011-03-23

arxiv.org/abs/1103.4644v1

Mathematics

Commutative Algebra

51 pages, 7 figures

Scientific paper

The classical Witt vectors are a ubiquitous object in algebra and number theory. They arise as a functorial construction that takes perfect fields k of prime characteristic p > 0 to p-adically complete discrete valuation rings of characteristic 0 with residue field k and are universal in that sense. A. Dress and C. Siebeneicher generalized this construction by producing a functor W_G attached to any profinite group G. The classical Witt vectors are those attached to the p-adic integers. Here we examine the ring structure of W_G(k) for several examples of pro-p groups G and fields k of characteristic p. We will show that the structure is surprisingly more complicated than the classical case.

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