This page is outdated, and will be reoganized and moved to https://www.ellipticcurve.info which is still under construction.
¶ General equation
An elliptic curve is the set of solutions to a general equation in the third degree in two variables.
The solutions to this equation are envisioned as points forming a curve in the Cartesian plane .
The general equation as given here has ten coefficients, g, h, j, k, m, p, q, r, s, and t.
¶ Weierstraß normal form
Despite the apparent horrific complexity of the general equation, it has been found that its ten coefficients can be reduced to four, with only two of them left free, by a linear transformation of coördinates from the plane to another plane, labeled .
For example, if and , the elliptic curve can be plotted roughly as shown. In Weierstraß normal form, the elliptic curve is symmetric (mirrored) about the x-axis, and the equation has no solutions in the real numbers where .
¶ Point group operation
¶ Rational points
See Rational Points.
¶ Finite fields
See the old wiki for more information.
