In mathematics, e is 2.7 1828. As a mathematical constant, e is the base of natural logarithmic function. Sometimes called Euler number, named after the Swiss mathematician Euler; There is also a relatively rare name Napier constant to commemorate the introduction of logarithm by Scottish mathematician John Napier. It is one of the most important constants in mathematics, just like pi and imaginary units I and E.

The origin of e in mathematics

1690, Leibniz first mentioned the constant e in his letter. The constant E mentioned for the first time in this paper is a table in the appendix of John Napier's logarithmic works published in 16 18. But it didn't record this constant, only a list of natural logarithms based on it, which is generally believed to be made by William Oughtred.

It was Jacob Bernoulli who first thought that e was a constant. Euler also heard of this constant, so at the age of 27, E was sent to calculus by publishing a paper.

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. The first use of e in publications is Euler mechanics in 1736. Although some researchers later used the letter C, E was widely used and finally became the standard.