1, Euler's formula is easy to understand and has two functions. One is for polyhedron, and the other is for series expansion. Euler formula mathematics plays a vital role in it, including two transcendental numbers, the base e of natural logarithm and pi, imaginary unit and natural number unit 1, which is the greatest discovery in the history of human mathematics. So in the eyes of mathematicians, Euler's formula should be God's formula.

2. The first person to prove Euler's formula was Cauchy, who was 20 years old. He affirmed the significance of Euler's formula by the method of polyhedral hypothesis. A transformation of Euler formula, Euler identity. Known as the most beautiful formula in mathematics.