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Dear William,
        Would you have time to make a picture for my talk this
coming Friday?
        Just a picture of the curve  y^3 - y - x = 0  for
|x| < .6  (say)  together with the affine  x-line drawn under-
neath. And dotted vertical tangent lines at the points where
3y^2 = 1, intersecting the  x-line at  \pm 2/sqrt(27).
        Slide size.
        I hope this is not too complicated. I'm in the rest
of the day (apart from a late swim).
        Would be greatly appreciated, thanks!!
        All the best,