Definition:Binomial Coefficient/Notation

Definition
The notation $\dbinom n k$ for the binomial coefficient was introduced by Andreas von Ettingshausen in his 1826 work Die combinatorische Analysis.

It appears to have become the de facto standard in recent years.

Other notations include:
 * $C \left({n, k}\right)$
 * ${}^n C_k$
 * ${}_n C_k$
 * $C^n_k$
 * ${C_n}^k$

all of which can cause a certain degree of confusion.