In combinatorics, Vandermonde's identity, or Vandermonde's convolution, named after Alexandre-Théophile Vandermonde (1772), states that
for binomial coefficients. This identity was given already in 1303 by the Chinese mathematician Zhu Shijie (Chu Shi-Chieh). See Askey 1975, pp. 59–60 for the history.
There is a q-analog to this theorem called the q-Vandermonde identity.
Read more about Vandermonde's Identity: Algebraic Proof, Combinatorial Proof, Generalized Vandermonde's Identity, The Hypergeometric Probability Distribution, Chu–Vandermonde Identity
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