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2. Factorial - Wikipedia

   en.wikipedia.org/wiki/Factorial

   Hindu scholars have been using factorial formulas since at least 1150, when Bhāskara II mentioned factorials in his work Līlāvatī, in connection with a problem of how many ways Vishnu could hold his four characteristic objects (a conch shell, discus, mace, and lotus flower) in his four hands, and a similar problem for a ten-handed god. [4]

3. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   The order of operations, that is, the order in which the operations in an expression are usually performed, results from a convention adopted throughout mathematics, science, technology and many computer programming languages.

4. List of mathematical functions - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematical_functions

   Gamma function: A generalization of the factorial function. Barnes G-function; Beta function: Corresponding binomial coefficient analogue. Digamma function, Polygamma function; Incomplete beta function; Incomplete gamma function; K-function; Multivariate gamma function: A generalization of the Gamma function useful in multivariate statistics.

5. Double factorial - Wikipedia

   en.wikipedia.org/wiki/Double_factorial

   These are counted by the double factorial 15 = (6 − 1)‼. In mathematics, the double factorial of a number n, denoted by n‼, is the product of all the positive integers up to n that have the same parity (odd or even) as n. [1] That is,

6. Falling and rising factorials - Wikipedia

   en.wikipedia.org/wiki/Falling_and_rising_factorials

   In mathematics, the falling factorial (sometimes called the descending factorial, [1] falling sequential product, or lower factorial) is defined as the polynomial ...

7. Factorial experiment - Wikipedia

   en.wikipedia.org/wiki/Factorial_experiment

   This experiment is an example of a 2 2 (or 2×2) factorial experiment, so named because it considers two levels (the base) for each of two factors (the power or superscript), or #levels #factors, producing 2 2 =4 factorial points. Cube plot for factorial design . Designs can involve many independent variables.