Pink's original relative Manin–Mumford conjecture for semi-abelian schemes
Pink's original relative Manin–Mumford conjecture for semi-abelian schemes
Let be a variety over , and let be an algebraic family of semi-abelian varieties. Let be an irreducible closed subvariety of dimension that is not contained in any proper closed subgroup scheme, possibly over a smaller base, of . Define fiberwise as the union of subgroups of codimension greater than .
Pink's original relative Manin–Mumford conjecture. The intersection is not Zariski dense in .
The source explicitly reports a counterexample when the family has nonzero toric rank, arising from a Ribet section. Thus the original formulation is refuted.
Sources & referencesView supporting material
Primary source
Kaiyuan Gu and Chenxin Huang, “On Special Subvarieties of the Universal Semi-abelian Scheme and Pink Conjectures”, arXiv:2410.17755 (2024).
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