On Saturday, 28 October 2023 at 15:26:35 UTC-7 Kwankyu wrote:
f1, f2, f3 are univariate polynomials (say in y) over rational function field (say in x). Then x and y are not always the variables X and Y of the coordinate ring of the affine plane. Things are more complicated if the curve is in space (of dim > 2). Sure. But you did get x,y somehow from the model with which C was given. Most likely, the A2 on which x,y are coordinates is obtained via projection from whatever model C was given by? Even if it is not a linear map, there are still expressions through which you can pull back x,y to the original model. You're right that the representations may get rather bad, but I'm not sure there's really something you can do about that. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/3ea279ab-4b25-43ee-856f-8e9ca8bcc147n%40googlegroups.com.
