The image of the function is a C-shaped curve passing through the point (1, 0), which runs through the first and fourth quadrants, and the curve of the fourth quadrant gradually approaches Y.
Axis, but do not intersect, the curve of the first quadrant gradually away from the x axis.
Its domain: x>0, and its range: y (infinity)
Logarithm of natural logarithm of extended data 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.
When the real number in the natural logarithm y=lnN is a continuous independent variable, it is called a logarithmic function, and it is denoted as y=lnx(x is the independent variable and y is the dependent variable).
References:
Baidu encyclopedia-natural logarithm