Is their any formula to simplify
$$(a,ab;q)_n$$ where $(a;q)_n=\prod_{i=0}^{n-1}(1−aq^i)$ denotes the q-shifted factorial.
P.S: $a$ and $b$ are complex numbers.
I'm glade for your help.
2026-03-25 15:57:33.1774454253
q-shifted factorial
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