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j-map for modular curve isomorphic to P1 is not a rational function of t #6107

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AndrewVSutherland opened this issue Jul 6, 2024 · 0 comments

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AndrewVSutherland commented Jul 6, 2024

The modular curve https://beta.lmfdb.org/ModularCurve/Q/7.21.0.a.1/ is isomrphic to P1 but its j-map is a function in Q(x,y) not Q(t) as claimed by the knowl https://beta.lmfdb.org/ModularCurve/Q/7.21.0.a.1/.

Either the j-map is not in the correct form or the knowl needs to change.

AndrewVSutherland added the Modular curves label

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