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:<math>\Phi_{pq}(z)=\frac{(z^{pq}-1) (z-1)}{(z^p-1) (z^q-1)}=\frac {\sum_{k=0}^{q-1} z^{pk} } {\sum_{k=0}^{q-1} z^k}</math>
:<math>\Phi_{pq}(z)=\frac{(z^{pq}-1) (z-1)}{(z^p-1) (z^q-1)}=\frac {\sum_{k=0}^{q-1} z^{pk} } {\sum_{k=0}^{q-1} z^k}</math>
[[Category:Mathematics]]