Finite-Dimensional Protori Are Adelic Tori

Abstract

We show the category of finite-dimensional compact connected abelian groups (finite-dimensional protori) {\it is} the category of {\it adelic tori}, for which there is a complete Lie theory: for each adelic torus $G$ there is a proper short exact sequence $0\ra\q^n\ra \mathcal{L}(G)\xrightarrow{\exp} G\ra 0$ with $\exp$ the {\it adelic exponential}. Extending the definition of nonarchimedean dimension to apply to number fields, the capstone result is the fact that all number fields have nonarchimedean dimension 1.