Product of sums
Calculus
Level
4
\[\displaystyle \large f(x) = \prod _{k=0}^{\infty}\left(\sum _{n=0}^{A-1}x^{nA^k}\right)\]
Find the value of \(f \left(\frac 12 \right)\), given that \(A\) is an integer greater than 1.
by
Julian Poon