English

$+\infty$-$w\_0$-generated field extensions

Commutative Algebra 2017-02-09 v1

Abstract

In this note, we continue to be interested in the relationship that connects the restricted distribution of finitude at the local level of intermediate fields of a purely inseparable extension K/kK/k to the absolute or global finitude of K/kK/k. In "{\it w_0w\_0-generated field extensions,}Arch. Math. {\bf 47}, (1986), 410-412", JK Deveney constructed an example of modular extension K/kK/k called w_0w\_0 -generated such that for any proper subfield LL of K/kK/k , LL is finite over kk, and for every nN n \in {\mathbf N}, we have [kpnK:k]=p2n [k^{p^{- n}} \cap K: k] = p^{2n} . This example has proved to be extremely useful in the construction of other examples of w_0w\_0-generated extensions. In particular, we prolong the w_0w\_0-generated to an extension of unspecified finite size.However, when K/kK/k is of unbounded size, we show that any modular extension of unbounded exponent admits a proper subextension of unbounded exponent. This brings us to study the w_0w\_0-generated in the restricted sense. In addition, with the aim of extending the w_0w\_0-generated to a purely inseparable extension of unbounded size, we propose other generalizations.

Keywords

Cite

@article{arxiv.1702.02312,
  title  = {$+\infty$-$w\_0$-generated field extensions},
  author = {El Hassane Fliouet and Fliouet Résumé},
  journal= {arXiv preprint arXiv:1702.02312},
  year   = {2017}
}

Comments

36 pp, in French. arXiv admin note: substantial text overlap with arXiv:1701.05430

R2 v1 2026-06-22T18:12:25.792Z