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.

Complex number algorithms are:

Addition, subtraction, multiplication and division. The sum of two complex numbers is still a complex number, its real part is the sum of the original two complex numbers, and its imaginary part is the sum of the original two imaginary parts. The addition of complex numbers satisfies the commutative law and associative law. In addition, when complex numbers are used as the base, exponent and real number of power sum logarithm, their operation rules can be derived from Euler formula E I θ = COS θ+I sin θ (arc system).