分圆多项式
n次分圆多项式，是指多项式x-1分解因式结果中的一个特定多项式f(x)，满足f(x)=0的解都不是低于n次的形如x-1=0的方程的解。 n次的分圆多项式的根是e 而(k,n)=1
Cyclotomic polynomial
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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
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