Leonhard Euler

Part I of Essay
15 April 1707 - 18 September 1783 is said to have been the most prolific mathematician in history. His 866 books and articles represent about one third of the entire body of research on mathematics, theoretical physics, and engineering mechanics published between 1726 ....

Part II of Essay
.... common many mathematical notations, including e, i, the pi symbol, and the sigma symbol; and laid the foundation for the theory of special functions, introducing the beta and gamma transcendental functions. He also worked on the origins of the calculus of variations. But his work did not only reside in math. He was also a pioneer in the field of topology and made number theory into a science, stating the prime number theorem and the law of biquadratic reciprocity. In physics he articulated Newtonian dynamics and laid the foundation of ana ....