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  2. Factorial - Wikipedia

    en.wikipedia.org/wiki/Factorial

    The value of 0! is 1, according to the convention for an empty product. [1] Factorials have been discovered in several ancient cultures, notably in Indian mathematics in the canonical works of Jain literature, and by Jewish mystics in the Talmudic book Sefer Yetzirah.

  3. Falling and rising factorials - Wikipedia

    en.wikipedia.org/wiki/Falling_and_rising_factorials

    The value of each is taken to be 1 (an empty product) when =. These symbols are collectively called factorial powers. [2] The Pochhammer symbol, introduced by Leo August Pochhammer, is the notation (), where n is a non-negative integer.

  4. Factorial number system - Wikipedia

    en.wikipedia.org/wiki/Factorial_number_system

    = ((((3×5 + 4)×4 + 1)×3 + 0)×2 + 11 + 0 = 463 10. (The place value is the factorial of one less than the radix position, which is why the equation begins with 5! for a 6-digit factoradic number.) General properties of mixed radix number systems also apply to the factorial number system.

  5. Stirling's approximation - Wikipedia

    en.wikipedia.org/wiki/Stirling's_approximation

    [1] [2] [3] One way of stating the approximation involves the logarithm of the factorial: ⁡ (!) = ⁡ + (⁡), where the big O notation means that, for all sufficiently large values of , the difference between ⁡ (!

  6. Gamma function - Wikipedia

    en.wikipedia.org/wiki/Gamma_function

    On the real line, the gamma function has a local minimum at z min ≈ +1.46163 21449 68362 34126 [15] where it attains the value Γ(z min) ≈ +0.88560 31944 10888 70027. [16] The gamma function rises to either side of this minimum.

  7. Corecursion - Wikipedia

    en.wikipedia.org/wiki/Corecursion

    A classic example of recursion is computing the factorial, which is defined recursively by 0! := 1 and n! := n × (n - 1)!.. To recursively compute its result on a given input, a recursive function calls (a copy of) itself with a different ("smaller" in some way) input and uses the result of this call to construct its result.

  8. 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,

  9. Bhargava factorial - Wikipedia

    en.wikipedia.org/wiki/Bhargava_factorial

    The factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n.For example, 5! = 5×4×3×2×1 = 120. By convention, the value of 0! is defined as 1.