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Algebraic $\overline {\mathbb {Q}}$-Groups as Abstract Groups
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Algebraic $\overline {\mathbb {Q}}$-Groups as Abstract Groups

Algebraic $\overline {\mathbb {Q}}$-Groups as Abstract Groups

Olivier Frecon

99 pages, parution le 29/08/2018

Résumé

Analyses the abstract structure of algebraic groups over an algebraically closed field $K$. For $K$ of characteristic zero and $G$ a given connected affine algebraic $\overline{\mathbb Q}$-group, the theorem describes the affine algebraic $\overline{\mathbb Q} $-groups $H$ such that the groups $H(K)$ and $G(K)$ are isomorphic as abstract groups.The author analyzes the abstract structure of algebraic groups over an algebraically closed field $K$.

For $K$ of characteristic zero and $G$ a given connected affine algebraic $\overline{\mathbb Q}$-group, the main theorem describes all the affine algebraic $\overline{\mathbb Q} $-groups $H$ such that the groups $H(K)$ and $G(K)$ are isomorphic as abstract groups. In the same time, it is shown that for any two connected algebraic $\overline{\mathbb Q} $-groups $G$ and $H$, the elementary equivalence of the pure groups $G(K)$ and $H(K)$ implies that they are abstractly isomorphic.

In the final section, the author applies his results to characterize the connected algebraic groups, all of whose abstract automorphisms are standard, when $K$ is either $\overline {\mathbb Q}$ or of positive characteristic. In characteristic zero, a fairly general criterion is exhibited.
  • Introduction
  • Background material
  • Expanded pure groups
  • Unipotent groups over $\overline{\mathbb Q} $ and definable linearity
  • Definably affine groups
  • Tori in expanded pure groups
  • The definably linear quotients of an $ACF$-group
  • The group $D_G$ and the Main Theorem for $K=\overline{\mathbb Q} $
  • The Main Theorem for $K eq \overline{\mathbb Q}$
  • Bi-interpretability and standard isomorphisms
  • Acknowledgements
  • Bibliography
  • Index of notations
  • Index
Olivier Frecon , Laboratoire de Mathematiques et Applications, Universite de Poitiers, France.

Caractéristiques techniques

  PAPIER
Éditeur(s) American mathematical society
Auteur(s) Olivier Frecon
Parution 29/08/2018
Nb. de pages 99
EAN13 9781470429232

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