ROUCHÉ & COMBEROUSSE, Traité de géométrie, 1883

Charles-François-Antoine Leroy (1793-1875) was a French mathematician and former professor at the École Polytechnique and the École Normale Supérieure, awarded the Legion of Honor. His work, Analysis Applied to the Geometry of Three Dimensions, is an advanced treatise on analytical geometry in space. It covers complex topics such as quadratic surfaces, the general theory of curved surfaces, and doubly curved lines—essential concepts for engineering and physics at the time. This revised fourth edition is a testament to its importance and continued use as a reference in higher education.