# Definition:Stirling Numbers of the Second Kind/Complex Numbers

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## Definition

Donald E. Knuth, in his *The Art of Computer Programming: Volume 1: Fundamental Algorithms, 3rd ed.* of $1997$, suggests an extension of the **Stirling numbers of the second kind** $\ds {r \brace r - m}$ to the real and complex numbers.

However, beyond stating that such a number is a polynomial in $r$ of degree $2 m$, and providing a few examples, he goes no further than that, and the details of this extension are unclear.

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## Sources

- 1997: Donald E. Knuth:
*The Art of Computer Programming: Volume 1: Fundamental Algorithms*(3rd ed.) ... (previous) ... (next): $\S 1.2.6$: Binomial Coefficients