Cyclotomic polynomial 分圆多项式
In mathematics, more specifically in algebra, the nth cyclotomic polynomial, for any positive integer n, is the unique irreducible polynomial with integer coefficients, which is a divisor of
and is not a divisor of
for any k < n. Its roots are the nth primitive roots of unity
, where k runs over the integers lower than n and coprime to n. In other words, the nth cyclotomic polynomial is equal to