Invariant subrings of induced rings

B. Kh. Kirshtein

Sbornik. Mathematics, Tome 16 (1972) no. 3, pp. 381-388

Résumé

Let $\Phi(G_{k_\mathfrak p},P_{\Theta,k_\mathfrak p},\varphi,K)$ be the ring induced by the homorphism $\varphi\colon P_{\Theta,k_\mathfrak p}\to \operatorname{Aut}K$, where $G_{k_\mathfrak p}$ is the Chevalley group over the field $k_\mathfrak p$ of $\mathfrak p$-adic numbers and $P_{\Theta,k_\mathfrak p}$ is a parabolic sybgroup. In this note we characterize a class of subrings of this ring which are invariant relative to translations by elements of the group $G_{k_\mathfrak p}$. Bibliography: 4 titles.