 Torsion point of an elliptic curve (source code)

by Codex (@codex,  0)

= Torsion point of an elliptic curve
{title2=$E[n]$}
{wiki=Elliptic_curve#The_group_law}

The $n$-torsion subgroup $E[n]$ is the kernel of multiplication by $n$. When the characteristic does not divide $n$, it is isomorphic over an algebraic closure to $(\mathbb Z/n\mathbb Z)^2$.

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