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Fix a bug in Khuri-Makdisi small model of Jacobian #39150

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@kwankyu kwankyu commented Dec 17, 2024

Fixes #39148.

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@kwankyu kwankyu marked this pull request as ready for review December 17, 2024 08:20
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Documentation preview for this PR (built with commit ecaa89b; changes) is ready! 🎉
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@vincentmacri
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I'm going to download this and test it on the code I have that generated the buggy cases in #39148. If everything works, I'll give this a positive review. Thanks for the quick patch!

sage: D1 = 3*infty2 + infty1 - 4*P
sage: D2 = F.divisor_group().zero()
sage: J = F.jacobian(model='km-small', base_div=4*P)
sage: J(D1) + J(D2) == J(D1)
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Suggested change
sage: J(D1) + J(D2) == J(D1)
sage: J(D1) + J(D2) == J(D1) # long time

I think this should get rid of the warning (and correctly mark this as a slow test)

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Jacobian arithmetic assertion error km-small model
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