cyclotomic polynomial The nth cyclotomic polynomial Φn(z) is the monic polynomial whose roots are the primitive n-th roots of unity. Φ4(z) = z2 + 1 as i and –i are the primitive fourth roots of unity.
cyclotomic polynomial
When n is prime
Φn(z) = zn−1 + zn−2 + … + z + 1
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