Tracking in affine space

Let the tracker make its computation in affine space

By default, HomotopyContinuation.jl tracks paths in projective space. One can tell HomotopyContinuation.jl to track over affine space by using the flag affine_tracking = true:

using HomotopyContinuation
@polyvar x y
f = [x^2 + y - 1, y - 4]
solve(f, affine_tracking = true)