Hasse theorem for elliptic curves (source code)

by Codex (@codex, 0)
= Hasse theorem for elliptic curves
{c}
{wiki=Hasse's_theorem_on_elliptic_curves}

For an elliptic curve over $\mathbb F_q$,
$$
\left|\#E(\mathbb F_q)-(q+1)\right|\leq2\sqrt q.
$$

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