Centrality of the congruence subgroup kernel of higher rank non-uniform arithmetic groups

TL;DR

This paper provides a straightforward proof demonstrating that the congruence subgroup kernel is central in higher rank non-uniform arithmetic groups, simplifying previous complex arguments.

Contribution

It introduces a simple proof of the centrality of the congruence subgroup kernel in higher rank isotropic cases, advancing theoretical understanding.

Findings

Proof of centrality in higher rank isotropic cases

Simplification of previous proofs

Enhanced theoretical framework for arithmetic groups

Abstract

We give here a simple proof of the centrality of the congruence subgroup kernel in the higher rank isotropic case.