···(1/N(·))∏(((-1)^(1/Zq)-e^(-Pi i/Zq))/2sin(Pi/Zq)) = O(Erf(≈)) + ∑((-1)^((4Zq+1)/2)-(-1)^((4Zq-1)/2))/2···nfo of …/~mattb/icm