I'm trying to obtain the planar projection of a curve by eliminating 5 variables in a system with 7 unknowns and 6 equations:
but it seems that I'm being far too naive. I know that the answer should have degree 30 in v and 16 in x, so it should be manageable; and I also remember that I had computed it in 2013, I just forgot how
Note that all equations are symmetric in c1...c5, except for the last one which says that x is the cross ratio of c1...c4.
Many thanks in advance! Laurent