pub fn richelot_partitions(roots: &[BigInt; 6], p: &BigInt) -> Vec<[Quad; 3]>Expand description
The 15 quadratic splittings of six roots into three pairs — the neighbours of a genus-2 Jacobian in the
(2,2)-isogeny graph. Each pair (rₐ, r_b) becomes the quadratic (x−rₐ)(x−r_b).