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The word "factorial" (originally French: factorielle) was first used in 1800 by Louis François Antoine Arbogast, [18] in the first work on Faà di Bruno's formula, [19] but referring to a more general concept of products of arithmetic progressions. The "factors" that this name refers to are the terms of the product formula for the factorial. [20]
Comparison of Stirling's approximation with the factorial. In mathematics, Stirling's approximation (or Stirling's formula) is an asymptotic approximation for factorials. It is a good approximation, leading to accurate results even for small values of .
Multinomial coefficient, Multinomial formula, Multinomial theorem; Multiplicities of entries in Pascal's triangle; Multiset; Multivariate gamma function; Narayana numbers; Negative binomial distribution; Nörlund–Rice integral; Pascal matrix; Pascal's pyramid; Pascal's simplex; Pascal's triangle; Permutation. List of permutation topics
In this formula and in many other places, the falling factorial () in the calculus of finite differences plays the role of in differential calculus. Note for instance the similarity of Δ ( x ) n = n ( x ) n − 1 {\displaystyle \Delta (x)_{n}=n(x)_{n-1}} to d d x x n = n x n − 1 {\displaystyle {\frac {\textrm {d}}{{\textrm {d}}x}}x^{n}=nx^{n ...
This list of mathematical series contains formulae for finite and infinite sums. It can be used in conjunction with other tools for evaluating sums. Here, is taken to have the value
In mathematics, Legendre's formula gives an expression for the exponent of the largest power of a prime p that divides the factorial n!. It is named after Adrien-Marie Legendre . It is also sometimes known as de Polignac's formula , after Alphonse de Polignac .
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, n ! ! = ∏ k = 0 ⌈ n 2 ⌉ − 1 ( n − 2 k ) = n ( n − 2 ) ( n − 4 ) ⋯ . {\displaystyle n!!=\prod _{k=0}^{\left\lceil {\frac {n}{2}}\right\rceil -1}(n-2k ...
The polynomial x 2 + cx + d, where a + b = c and ab = d, can be factorized into (x + a)(x + b).. In mathematics, factorization (or factorisation, see English spelling differences) or factoring consists of writing a number or another mathematical object as a product of several factors, usually smaller or simpler objects of the same kind.
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