E is a natural constant, a law in mathematics, about 2.7 1828, and an infinite acyclic decimal. As a mathematical constant, e is the base of natural logarithmic function. Sometimes called Euler number, named after the Swiss mathematician Euler; Also known as Napier constant, in memory of Scottish mathematician John Napier. Like pi and imaginary unit I.

The origin of e in mathematics

The earliest known uses of the constant e are 1690 and 169 1 year, which is represented by B. In 1727, Euler began to use e to represent this constant. E was first used in publications, and it was Euler Mechanics in 1736. Although some researchers later used the letter C, E was widely used and finally became the standard.

The important point of exponential function based on E is that its function is equal to its derivative. E is irrational number and transcendental number (see Lindemann-Weierstrass theorem).