Zywina's generalized exceptional j-invariant conjecture

Let HGL2(Z^)H\leq\operatorname{GL}_2(\widehat{\mathbb{Z}}) be an agreeable subgroup such that XH(Q)X_H(\mathbb{Q}) is finite, and let xXH(Q)x\in X_H(\mathbb{Q}) be a non-special point.

Zywina's generalized conjecture. Then

j(x)Jexc.j(x)\in J_{\rm exc}.

This combines the explicit uniformity conjecture with Zywina's conjecture for AfiniteA_{\rm finite}, extending the exceptional-jj assertion to every agreeable subgroup with finitely many rational points. The source does not indicate that this combined conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Maarten Derickx, Sachi Hashimoto, Filip Najman and Ari Shnidman, “Rational points on modular curves: parameterization and geometric explanations”, arXiv:2602.20964 (2026).

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