Definition: Generally, Function like y=a^x(a>0 and a≠1) (x∈R) is called Exponentiation Function. in other words Exponentiation is independent variable, power is dependent variable, Base is constant Function is Exponentiation Function. in other words Exponentiation as the independent variable, power as the dependent variable, and Base as the constant Function is Exponentiation Function. It is one kind of elementary Function. You can extend define as C to parse Function.