number-theory / Anabelian geometry; rational points on curves

Grothendieck's section conjecture for the modular curves X0(N) and X1(N) over Q

Claims Theorem 8.2: the global section conjecture holds for every smooth proper geometrically connected curve of genus at least two over a number field whose finite-cover descent locus equals its rational points; by Stoll's criteria this includes curves mapping nonconstantly to an abelian variety with finitely many rational points and trivial divisible Sha, and the modular curves X0(N)X_0(N), X1(N)X_1(N) of genus at least two over Q\mathbb Q. It does NOT prove the section conjecture for arbitrary curves over number fields; the descent-locus equality remains a separate hypothesis in general.

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number-theorySep 24, 2026Significance 42/100Registry: unreviewed

Grothendieck's section conjecture for the modular curves X0(N) and X1(N) over Q

Prior state unknown→proved

Claims Theorem 8.2: the global section conjecture holds for every smooth proper geometrically connected curve of genus at least two over a number field whose finite-cover descent locus equals its rational points; by Stoll's criteria this includes curves mapping nonconstantly to an abelian variety with finitely many rational points and trivial divisible Sha, and the modular curves X0(N)X_0(N), X1(N)X_1(N) of genus at least…

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Claims Theorem 8.2: the global section conjecture holds for every smooth proper geometrically connected curve of genus at least two over a number field whose finite-cover descent locus equals its rational points; by Stoll's criteria this includes curves mapping nonconstantly to an abelian variety with finitely many rational points and trivial divisible Sha, and the modular curves X0(N)X_0(N), X1(N)X_1(N) of genus at least two over Q\mathbb Q. It does NOT prove the section conjecture for arbitrary curves over number fields; the descent-locus equality remains a separate hypothesis in general.

Claims Theorem 8.2: the global section conjecture holds for every smooth proper geometrically connected curve of genus at least two over a number field whose finite-cover descent locus equals its rational points; by Stoll's criteria this includes curves mapping nonconstantly to an abelian variety with finitely many rational points and trivial divisible Sha, and the modular curves X0(N)X_0(N), X1(N)X_1(N) of genus at least two over Q\mathbb Q. It does NOT prove the section conjecture for arbitrary curves over number fields; the descent-locus equality remains a separate hypothesis in general.

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Grothendieck's section conjecture for the modular curves X0(N) and X1(N) over Q — Mathematical Frontier Network