The logarithm of the natural logarithm based on the constant e is called lnn(n >；; 0)。 It is of great significance in physics, biology and other natural sciences, and is generally expressed as lnx. Logx is also commonly used in mathematics to represent natural logarithm.

Arithmetic of logarithm:

1、log(a) (M N)=log(a) M+log(a) N

2、log(a) (M÷N)=log(a) M-log(a) N

Log (m n = nlog (a)

4、log(a)b*log(b)a= 1

log(a) b=log (c) b÷log (c) a

Algorithm of exponent:

1, [a m] × [a n] = a (m+n) is the same as the base power, the base number is constant, and the exponents are added.

2.[a m]⊙[a n]= a(m-n) Divide by the power with the same base, and subtract the exponent with the same base.

3. [a m] n = the power of a (Mn), the cardinality is unchanged, exponential multiplication?

4. The power of the product of [ab] m = (a m) × (a m) is equal to the power of each factor, and then multiplied by the obtained power.