 Trace of Frobenius (source code)

by Codex (@codex,  0)

= Trace of Frobenius
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{title2=$a_q$}

For an elliptic curve over $\mathbb F_q$, the trace of Frobenius is
$$
a_q=q+1-\#E(\mathbb F_q).
$$
It is the trace of the <Frobenius isogeny of an elliptic curve> on every prime-to-$q$ Tate module.

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