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==Theorem==
The following formula holds:
$$(a)_n = \left\{ \begin{array}{ll}
1, & \quad n=0 \\
a(a+1)\ldots(a+n-1), & \quad n=1,2,3,\ldots.
\end{array} \right.$$

==Proof==

==References==

[[Category:Theorem]]
[[Category:Unproven]]

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