LEBESGUE, Les Coniques, 1955

Henri Lebesgue (1875-1941), a member of the Institute and professor at the Collège de France and the École Normale Supérieure de Sèvres, is primarily known for his integration theory. However, his work Les Coniques (Conics), prefaced by Paul Montel, demonstrates his interest in more classical geometry topics. Conics (circles, ellipses, parabolas, hyperbolas) are fundamental curves in mathematics and have important applications in physics (planetary trajectories, optics).