The most basic definition of power is: let a be a certain number, n be a positive integer, and the nth power of a be represented as an, which represents the result obtained by multiplying n a's together, such as 2 ⁴=2 × 2 × 2=16. The definition of power can also be extended to zero power, negative power, and so on. When inputting mathematical formulas on a computer, the symbol "^" is often used to represent the power because it is not convenient to input the power. For example, 2 to the power of 5 is usually represented as 2 ^ 5.