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Hi Dick (and everybody), thank you. The problem is that I'm trying to find complex roots of a complex function: f(z)=0 that means Real(f(x,y))=0 and Imag(f(x,y)=0) with x+iy=z. for the real part (x) I have no problem, but the imaginary part of the root (y) can be also 10^-11, 10^-12 ; this means that I need high precision to see if the value of the function in that root is really zero. Thank you, Celevic