E is a constant, equal to 2.7 1828 183…
Lnx can be understood as ln(x), that is, the logarithm of x with the base of e, that is, how many powers of e are equal to X.
lnx=loge^x
Extended data:
When the real number in the natural logarithm lnN is a continuous independent variable, it is called a logarithmic function and is denoted as y=lnx(x is the independent variable and y is the dependent variable).
The meaning of constant e is the limit value that can be achieved by doubling the growth continuously in unit time.
The base e of natural logarithm is given by an important limit.
E is an infinite acyclic decimal, and its value is approximately equal to 2.7 1828 1828459…, which is a transcendental number.
References:
Natural Logarithm-Baidu Encyclopedia