On the Structure of Witt-Burnside Rings Attached to Pro-p Groups
The $p$-typical 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 $p$-typical Witt vectors arise as 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 $p$-typical case.
2010 Mathematics Subject Classification:
Keywords and Phrases:
Full text: dvi.gz 71 k, dvi 255 k, ps.gz 322 k, pdf 280 k.
Home Page of DOCUMENTA MATHEMATICA