# Estimating class numbers over metabelian extensions

## TL;DR

This paper investigates the growth of class groups in specific non-abelian $p$-adic Lie extensions, extending classical Iwasawa theory results to more complex Galois groups and providing refined asymptotic formulas.

## Contribution

It generalizes classical abelian class number formulas to certain non-commutative $p$-adic Lie extensions with detailed asymptotic analysis.

## Key findings

- Provides asymptotic formulas for class group sizes in non-abelian extensions.
- Extends Iwasawa theory results beyond abelian cases.
- Offers more precise estimates than previous non-commutative results.

## Abstract

Let $p$ be an odd prime and $L/K$ a $p$-adic Lie extension whose Galois group is of the form $\mathbb{Z}_p^{d-1}\rtimes \mathbb{Z}_p$. Under certain assumptions on the ramification of $p$ and the structure of an Iwasawa module associated to $L$, we study the asymptotic behaviours of the size of the $p$-primary part of the ideal class groups over certain finite subextensions inside $L/K$. This generalizes the classical result of Iwasawa and Cuoco-Monsky in the abelian case and gives a more precise formula than a recent result of Perbet in the non-commutative case when $d=2$.