If we add a point at infinity, an elliptic curve forms an abelian group (as long as a certain constraint is met on the values of a and b, which ensures that the polynomial x3 + ax + b does not have a double zero). Each point on the curve is an element of the group, and a geometrical construction allows us to define addition of points in a consistent manner. |
If we add a point at infinity, an elliptic curve forms an abelian group (as long as a certain constraint is met on the values of a and b, which ensures that the polynomial x3 + ax + b does not have a multiple zero and the curve does not have a singularity). Each point on the curve is an element of the group, and a geometrical construction allows us to define addition of points in a consistent manner. |