LEGENDRE, Éléments de Géométrie, 1837

Adrien-Marie Legendre (1752-1833) was a distinguished French mathematician, a member of the Institut and the Legion of Honour, as well as the Royal Society of London. His contributions were major in number theory, analysis (Legandre functions, Legendre transform), and geometry. His "Elements of Geometry" was an international reference textbook, rivaling Euclid's "Elements" in its clarity and rigor.