Mohsen Hachtroudi and the Geometry of Differential Equations

Abstract

Mohsen Hachtroudi (1908--1976) was one of the founders of modern mathematics in Iran and the first Iranian mathematician to gain international recognition for original research in modern times. A student of Élie Cartan, he introduced the canonical projective connection now known as the \emph{Hachtroudi connection}, whose significance has become increasingly apparent through later developments in Cartan geometry, CR geometry, and parabolic geometry. This article combines a historical and mathematical study of\\ Hachtroudi's life and work. It examines his education in Iran and France, his role in establishing modern mathematical research and higher education in Iran, and his influence as a teacher, essayist, and public intellectual. It also presents a modern account of his mathematical contributions and their continuing impact on the geometry of differential equations and the theory of geometric structures.