If $(x)_{n}$ refers to
$$x(x-1)\cdots(x-n+1)$$
then what does $(xy;x)_{n}$ refer to?
Is it
$$xy(xy-1)\ldots(xy-n+1)?$$
Thanks.
The notation in question is used on page two of this paper.
2025-01-13 05:57:52.1736747872
Falling Factorial Notation
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