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  2. Wilson's theorem - Wikipedia

    en.wikipedia.org/wiki/Wilson's_theorem

    Lagrange gave the first proof in 1771. [4] ... Table of factorial and its remainder ... (p − 1)! + 10 (mod p). This is Wilson's theorem. Proof using the Sylow ...

  3. Zero to the power of zero - Wikipedia

    en.wikipedia.org/wiki/Zero_to_the_power_of_zero

    Zero to the power of zero, denoted as 0 0, is a mathematical expression that can take different values depending on the context. In certain areas of mathematics, such as combinatorics and algebra, 0 0 is conventionally defined as 1 because this assignment simplifies many formulas and ensures consistency in operations involving exponents.

  4. Factorial - Wikipedia

    en.wikipedia.org/wiki/Factorial

    The factorial of also equals the product of with the next smaller factorial: ! = () = ()! For example, ! =! = = The value of 0! is 1, according to the convention for an empty product . [ 1 ]

  5. Proofs of Fermat's little theorem - Wikipedia

    en.wikipedia.org/wiki/Proofs_of_Fermat's_little...

    For example, the fixed points of the function T 3 (x) are 0, 1/2, and 1; they are marked by black circles on the following diagram: Fixed points of a T n function. We will require the following two lemmas. Lemma 1. For any n ≥ 2, the function T n (x) has exactly n fixed points. Proof.

  6. Empty product - Wikipedia

    en.wikipedia.org/wiki/Empty_product

    For example, the empty products 0! = 1 (the factorial of zero) and x 0 = 1 shorten Taylor series notation (see zero to the power of zero for a discussion of when x = 0). Likewise, if M is an n × n matrix, then M 0 is the n × n identity matrix , reflecting the fact that applying a linear map zero times has the same effect as applying the ...

  7. Zero-product property - Wikipedia

    en.wikipedia.org/wiki/Zero-product_property

    The ring of 2×2 matrices with integer entries does not satisfy the zero-product property: if = and = (), then = () = =, yet neither nor is zero. The ring of all functions f : [ 0 , 1 ] → R {\displaystyle f:[0,1]\to \mathbb {R} } , from the unit interval to the real numbers , has nontrivial zero divisors: there are pairs of functions which ...

  8. Mathematical induction - Wikipedia

    en.wikipedia.org/wiki/Mathematical_induction

    The simplest and most common form of mathematical induction infers that a statement involving a natural number n (that is, an integer n ≥ 0 or 1) holds for all values of n. The proof consists of two steps: The base case (or initial case): prove that the statement holds for 0, or 1.

  9. Factorion - Wikipedia

    en.wikipedia.org/wiki/Factorion

    Let be a natural number. For a base >, we define the sum of the factorials of the digits [5] [6] of , :, to be the following: ⁡ = =!. where = ⌊ ⁡ ⌋ + is the number of digits in the number in base , ! is the factorial of and