
research note
Integrality of Averages of Roots of Unity and Perfect Isometries
This paper addresses the problem of characterizing functions f — Z_n → Z_n for which the averages of roots of unity expressions µ_b(f) = (1/n) ∑_{x=0}^{n-1} ω^{f(x)+bx} (with ω=e^{2πi/n}) are algebr…










