1991 marks the 100th anniversary of the appearance of a note by Alfred Cardew Dixon proving a famous combinatorial identity. The following slight generalisation also bears Dixon’s name:
for nonnegative integers and the permitted range of the integer . In the paper we can find three proofs of Dixon’s identity, namely Dixon’s original proof, a second proof using the Lagrange inversion formula, and a third one using WZ pairs. From the paper we can learn some biographical facts about Dixon who was the President of the London Mathematical Society in 1931-33.