Use power to represent n (x = n m) or logarithm to represent a(x = logaN)(a(a > 0 and a≠ 1). For example, for power x = 3 2, the radix is 3; For the logarithm x=log39, the base is 3. In mathematics, the base number is a basic mathematical concept, which is very important for understanding and calculating the power sum logarithm.

Cardinality can also be regarded as a factor in a series (such as 1+ 1/n), which determines the growth rate of the series. If the cardinality in a series is larger, the growth rate of the series will be faster. This is because the size of the base directly affects the result of power or logarithm.