Bell polynomials
Polynomials in combinatorial mathematics / From Wikipedia, the free encyclopedia
For a different family of polynomials Bn(x) occasionally called Bell polynomials, see Touchard polynomials.
In combinatorial mathematics, the Bell polynomials, named in honor of Eric Temple Bell, are used in the study of set partitions. They are related to Stirling and Bell numbers. They also occur in many applications, such as in Faà di Bruno's formula.