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Multiplicative partitions of factorials are expressions of values of the factorial function as products of powers of prime numbers. They have been studied by Paul Erdős and others. [1] [2] [3] The factorial of a positive integer is a product of decreasing integer factors, which can in turn be factored into prime numbers.
Stirling permutations, permutations of the multiset of numbers 1, 1, 2, 2, ..., k, k in which each pair of equal numbers is separated only by larger numbers, where k = n + 1 / 2 . The two copies of k must be adjacent; removing them from the permutation leaves a permutation in which the maximum element is k − 1 , with n positions into ...
3.2 Efficient infinite series. 3.3 Other infinite series. 3.4 Machin-like formulae. 3.5 Infinite products. 3.6 Arctangent formulas. ... is the rising factorial) [10] ...
The theorem was first stated by Ibn al-Haytham c. 1000 AD. [2] Edward Waring announced the theorem in 1770 without proving it, crediting his student John Wilson for the discovery. [3] Lagrange gave the first proof in 1771. [4] There is evidence that Leibniz was also aware of the result a century earlier, but never published it. [5]
[24] [25] In the 2 × 3 example above, the degrees of freedom for ,, and the interaction are 1, 2 and 2, respectively. In a fractional factorial experiment, the contrast vectors belonging to a given effect are restricted to the treatment combinations in the fraction. Thus, in the half-fraction {11, 12, 13} in the 2 × 3 example, the three ...
From this it follows that the rightmost digit is always 0, the second can be 0 or 1, the third 0, 1 or 2, and so on (sequence A124252 in the OEIS).The factorial number system is sometimes defined with the 0! place omitted because it is always zero (sequence A007623 in the OEIS).
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.