English

On the behaviour of Brauer $p$-dimensions under finitely-generated field extensions

Rings and Algebras 2015-06-24 v7

Abstract

The present paper shows that if qPq \in \mathbb P or q=0q = 0, where P\mathbb P is the set of prime numbers, then there exist characteristic qq fields Eq,k ⁣: kNE _{q,k}\colon \ k \in \mathbb N, of Brauer dimension Brd(Eq,k)=k(E _{q,k}) = k and infinite absolute Brauer pp-dimensions abrdp(Eq,k)_{p}(E _{q,k}), for all pPp \in \mathbb P not dividing q2qq ^{2} - q. This ensures that Brdp(Fq,k)=_{p}(F _{q,k}) = \infty , pq2qp \dagger q ^{2} - q, for every finitely-generated transcendental extension Fq,k/Eq,kF _{q,k}/E _{q,k}. We also prove that each sequence ap,bpa _{p}, b _{p}, pPp \in \mathbb P, satisfying the conditions a2=b2a _{2} = b _{2} and 0bpap0 \le b _{p} \le a _{p} \le \infty , equals the sequence abrdp(E),Brdp(E)_{p}(E), {\rm Brd}_{p}(E), pPp \in \mathbb P, for a field EE of characteristic zero.

Keywords

Cite

@article{arxiv.1207.0965,
  title  = {On the behaviour of Brauer $p$-dimensions under finitely-generated field extensions},
  author = {I. D. Chipchakov},
  journal= {arXiv preprint arXiv:1207.0965},
  year   = {2015}
}

Comments

LaTeX, 14 pages: published in Journal of Algebra {\bf 428} (2015), 190-204; the abstract in the Metadata updated to fit the one of the paper