Generalized Pochhammer symbol

In mathematics, the generalized Pochhammer symbol of parameter $\alpha >0$ and partition $\kappa =(\kappa _{1},\kappa _{2},\ldots ,\kappa _{m})$ generalizes the classical Pochhammer symbol, named after Leo August Pochhammer, and is defined as

(a)_{\kappa }^{(\alpha )}=\prod _{i=1}^{m}\prod _{j=1}^{\kappa _{i}}\left(a-{\frac {i-1}{\alpha }}+j-1\right).

It is used in multivariate analysis.

References

Dunkl, Charles F.; Xu, Yuan (2001), Orthogonal Polynomials of Several Variables, Encyclopedia of Mathematics and its Applications, 81, Cambridge University Press, p. 308, ISBN 9780521800433

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