Introduction
摘要
This book is an exploration of Carnot-Carathéodory spaces through the perspective of Lie groups. It is intended to study these non-smooth geometries, focusing on the prototypical examples called Carnot groups. Carnot groups are a fundamental class of nilpotent Lie groups equipped with sub-Riemannian or, more generally, sub-Finsler structures. They play an essential role in various mathematical domains, including metric geometry and geometric group theory—as we shall see.