Its a 4:1 map so you can't invert it... On Saturday, May 24, 2014 4:45:11 PM UTC+1, diophan wrote: > > Defn: Defined on coordinates by sending (x : y : z) to > (1/8*x*y - 1/16*y^2 - 1/8*y*z : -x^2 + 1/8*x*y + 3/16*y^2 + x*z > + 3/8*y*z : -1/256*y^2) > > >
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