Touchard polynomial

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English

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Touchard polynomial

Etymology

Studied by Jacques Touchard.

Noun

Touchard polynomial (plural Touchard polynomials)

(mathematics) Any member of a polynomial sequence of binomial type defined by $T_{n}(x)=\sum _{k=0}^{n}S(n,k)x^{k}=\sum _{k=0}^{n}\left\{{n \atop k}\right\}x^{k},$ where $S(n,k)=\left\{{n \atop k}\right\}$ is a Stirling number of the second kind, i.e. the number of partitions of a set of size n into k disjoint non-empty subsets.

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