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About the properities of sum of powers of items in a polynomial
Given a polynomial $f_1=a_1x+a_2x^2+\cdots+a_{p-1}x^{p-1}\in\mathbb{Z}[x]/(x^{p}-1)$, with prime $p$, we may generate the other $p-1$ polynomials:
\begin{eqnarray*}
f_2&=&a_1^2x^2+\cdots+a_{p-...
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