He also studied the spiral bearing his name, obtained formulas for the volumes of surfaces of revolution (paraboloid, ellipsoid, hyperboloid), and an ingenious method of exponentiation for expressing very large numbers.
Tamén estudou a espiral que leva o seu nome, obtivo fórmulas para os volumes das superficies de revolución (paraboloide, elipsoide, hiperboloide) e un método de exponenciación para expresar números moi grandes.