### the product of a series in fenics

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3 months ago by
I have an algorithm, and I have figured out that its run-time complexity follows the following formula:
$\sum_{i=1}^n^2\left(j1\left(Wn\cdot r\right)\right)$i=1n2(j1(Wn·r))
in fact I need to know how I can calculate the square of a series please someone can help me
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