Simply put, ln is a logarithmic function based on e, and b = e a is equivalent to a=lnb.

Logarithm based on constant e. Write lnn (n >; 0)。 It is of great significance in physics, biology and other natural sciences. The general representation is lnx. Logx is also commonly used in mathematics to represent natural logarithm. In order to avoid confusion with the commonly used logarithm lgx based on 10, you can use "write all" ex.

Extended data

Exact value of е:

Like π, е is an irrational number, which is infinitely cyclic, so we can't know its exact value. The result of extending е to 50 decimal places is 2.718281828459045353+03560297654.

If only fractions are used, the denominator and numerator are limited to 2 digits, and the best approximation of е is 87/32. Interestingly, if the denominator and numerator are limited to 3 digits, the best approximation is 878/323. The second score happens to be the palindrome expansion of the first score.

Baidu encyclopedia-natural logarithm

Baidu Encyclopedia-Natural Constant