👉 "marengo" is a term in Italian mathematics that refers to an ellipse. It was first introduced by Giuseppe Monster in 1864 and later by Carl Gustav Jacob Jacobi in 1902. The ellipse defined by the equation \( \frac{x^2}{a^2} + \frac{y^2}{b^2} = 1 \) is known as a "marengo" if its eccentricity \( e \) satisfies the inequality