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Timeline for Questions on the $j$-invariant

Current License: CC BY-SA 4.0

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Oct 5, 2021 at 17:45 comment added Henri Cohen This is classical (Schwarz is 19th century) but was explained to me by Frits Beukers. I am sure some reader of MO can give suitable references.
Oct 4, 2021 at 21:13 comment added Rdrr This is exactly the kind of answer I was looking for. Do you have a reference for some of the details?
Oct 4, 2021 at 21:05 history answered Henri Cohen CC BY-SA 4.0