UNEXPECTED SUBGROUP SCHEMES OF PGL 2,k IN CHARACTERISTIC 2
Langue
en
Document de travail - Pré-publication
Résumé en anglais
If the characteristic of a field $k$ is odd any infinitesimal group scheme of $PGL_{2,k}$ lifts to $SL_{2,k}$. In this paper, we prove that this is not true in characteristic $2$ and we give a complete description, up to ...Lire la suite >
Mots clés en anglais
infinitesimal group schemes
actions of group schemes