E is one of the largest and most important constants in mathematics, also known as Euler number E. E is an irrational number, and E is about 2.7 18 1828.

What is about 1 and e?

E is an irrational number, e = 2.71828182845938+0352 6624975, and so on.

How much e equals depends on the number of decimal places, and the rounding method is adopted, such as:

If 1 digit is taken after the decimal point, then E is about 2.7;

Take two decimal places, then e is about equal to 2.72;

If three decimal places are taken, e is approximately equal to 2.718;

If four decimal places are taken, e is approximately equal to 2.7183;

Take five decimal places, then e is about equal to 2.7 1828, and so on.

2. the characteristics of e

When it is first used for logarithm, Lne= 1. For exponential function e x, no matter how many derivatives are taken, the derivative value is e x itself. The characteristic of e is that it is not defined geometrically. As we all know, pi is defined according to the ratio of circumference to diameter. E is a constant about growth rate and change rate.

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The natural constant, symbol E, is a constant in mathematics, an infinite acyclic decimal and a transcendental number, and its value is about 2.718281828459045. It is the basis of natural logarithmic function. It is 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. Like pi and imaginary unit I, it is one of the most important constants in mathematics. The first known use of the constant e is the communication between Leibniz and Huygens at 1690 and 169 1, which is denoted by b.

1727, Euler began to express this constant with e; 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.