In mathematics, the multiplication theorem is a certain type of identity obeyed by many special functions related to the gamma function. For the explicit case of the gamma function, the identity is a product of values; thus the name. The various relations all stem from the same underlying principle; that is, the relation for one special function can be derived from that for the others, and is simply a manifestation of the same identity in different guises.
The multiplication theorem is:
G(a)*G(a+1/b)*G(a+2/b)*...*G(a + b-1/b) = prod_[k=0 to b-1] G(a + k/b)
where G is the gamma function.
For integer k >= 1, and is sometimes called Gauss's multiplication formula, in honour of Carl Friedrich Gauss.
Antonio Trujillo-Ortiz (2021). gaussmult (https://www.mathworks.com/matlabcentral/fileexchange/29917-gaussmult), MATLAB Central File Exchange. Retrieved .
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