ni...@lysator.liu.se (Niels Möller) writes: As far as I see, a plain Newton iteration on won't produce an x' inverse with 4n bits of accuracy. One would need aither two iterations, or some other trick, maybe mixing in some interpolation of x' - x. I don't think one should struggle in order to get n -> 2n bits in a Newtonian iteration. It is enough to achieve n -> 2n-k for some constant k.
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