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Division polynomials : ウィキペディア英語版
Division polynomials
In mathematics the division polynomials provide a way to calculate multiples of points on elliptic curves and to study the fields generated by torsion points. They play a central role in the study of counting points on elliptic curves in Schoof's algorithm.
== Definition ==
The set of division polynomials is a sequence of polynomials in \mathbb() with x, y, A, B free variables that is recursively defined by:
::\psi_ = 0
::\psi_ = 1
::\psi_ = 2y

::\psi_ = 3x^ + 6Ax^ + 12Bx - A^

::\psi_ = 4y(x^ + 5Ax^ + 20Bx^ - 5A^x^ - 4ABx - 8B^ - A^)
::\vdots

::\psi_ = \psi_ \psi_^ - \psi_ \psi ^_ \text m \geq 2

::\psi_ = \left ( \frac \right ) \cdot ( \psi_\psi^_ - \psi_ \psi ^_) \text m \geq 3
The polynomial \psi_n is called the ''n''th division polynomial.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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