Let p be a prime number and ω be a p-th root of unity. Suppose a0,a1,…,ap−1,b0,b1,…,bp−1 be integers such that a0ω0+a1ω1+…ap−1ωp−1 and b0ω0+b1ω1+…bp−1ωp−1 are also integers
Prove that (a0ω0+a1ω1+…ap−1ωp−1)−(b0ω0+b1ω1+…bp−1ωp−1) is divisible by p if and only if p divides all of a0−b0, a1−b1, …, ap−1−bp−1
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