This chapter provides an overview of the content and structure of the book "Lectures on n-Dimensional Quasiconformal Mappings" by Jussi Väisälä, published by Springer-Verlag in 1971. The book is based on lectures given at the University of Helsinki in 1967-1968 and covers the basic theory of quasiconformal mappings in \( \mathbb{R}^n \) for \( n \geq 3 \). The introduction explains the historical context, noting that while 2-dimensional quasiconformal mappings were introduced in 1928, higher-dimensional mappings were studied more extensively starting from 1959. The book aims to provide a comprehensive exposition of the theory, including definitions, properties, and examples of quasiconformal mappings, as well as background in real analysis and analytic properties. Key topics include the modulus of a curve family, dilatations, boundary extension, distortion, and mapping problems. The chapter also outlines the notation and terminology used throughout the book.This chapter provides an overview of the content and structure of the book "Lectures on n-Dimensional Quasiconformal Mappings" by Jussi Väisälä, published by Springer-Verlag in 1971. The book is based on lectures given at the University of Helsinki in 1967-1968 and covers the basic theory of quasiconformal mappings in \( \mathbb{R}^n \) for \( n \geq 3 \). The introduction explains the historical context, noting that while 2-dimensional quasiconformal mappings were introduced in 1928, higher-dimensional mappings were studied more extensively starting from 1959. The book aims to provide a comprehensive exposition of the theory, including definitions, properties, and examples of quasiconformal mappings, as well as background in real analysis and analytic properties. Key topics include the modulus of a curve family, dilatations, boundary extension, distortion, and mapping problems. The chapter also outlines the notation and terminology used throughout the book.