Computing primitive $ n$ -th roots of unity

A preliminary step of the FFT-based multiplication is to find primitive $ n$ -th roots of unity. We explain in this section how to compute such numbers in $ {\mbox{${\mathbb{K}}$}} = {\mbox{${\mathbb{Z}}$}}/p{\mbox{${\mathbb{Z}}$}}$ .



Subsections
Marc Moreno Maza
2008-01-07