0: rational number, others are not explained.

1: rational number, others are not explained.

π: Irrational number, also known as "pi", is the ratio of circumference to diameter, which has applications in many fields such as geometry, algebra, calculus and so on. π≈3. 14 159……

E: Irrational numbers, also called "natural constants", are not as well known as the first three, but they are as important as π. In advanced mathematics, e is an extremely important constant. e≈2.7 1828……

I: imaginary number, the unit of imaginary number, representing the square root of-1, that is, I? =- 1, which is extremely important in the field of complex numbers.

There is a formula called "God Formula" in mathematics, called "Euler Formula":

e^(iπ)+ 1=0

This formula is simple and puzzling, but it contains the five most important constants in mathematics, and at the same time it is of great significance. It links geometry with algebra, so it is called "mathematical overpass".