So, I was reading book on generating functions(https://www.math.upenn.edu/~wilf/gfology2.pdf), and I am not sure what was the reasoning behind setting $x=1/r$ in $(1.6.6)$, or rather is it just allowed to put any value there?
2026-03-27 12:01:46.1774612906
Wilf's generatingfunctionology 1.6.6
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