Exponentiation
Exponentiation is a mathematical operation, written as , involving two numbers, the "base" and the "exponent" . When is a positive integer, exponentiation corresponds to repeated multiplication of the base: that is, is the product of multiplying bases:
Exponential factorial
The exponential factorial of a positive integer "n", denoted by "n"$, is "n" raised to the power of "n" − 1, which in turn is raised to the power of "n" − 2, and so on and so forth, that is,