The conductor $N$ of a genus 2 curve $X/\Q$ is the conductor of its Jacobian $\mathrm{Jac}(X)$. This is a positive integer that divides the discriminant of $X$ and is divisible by every prime of bad reduction for $\mathrm{Jac}(X)$ (but not necessarily by every prime of bad reduction for $X$).
The valuation of $N$ at a prime $p$ satisfies the following bounds.
$p$: | $2$ | $3$ | $5$ | $\ge 7$ |
$v_p(N)$: | $20$ | $10$ | $9$ | $4$ |
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- Last edited by John Cremona on 2023-07-11 13:57:09
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