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Effective atypical intersections and applications to orbit closures

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arxiv 2406.16628 v2 pith:OFWZXQU2 submitted 2024-06-24 math.AG math.DSmath.NT

classification math.AGmath.DSmath.NT
keywords atypicalclosuresorbitalgorithmconjectureeffectivefilipgive
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abstract

We propose a unifying setting for dealing with monodromically atypical intersections that goes beyond the usual Zilber-Pink conjecture. In particular we obtain a new proof of finiteness of the maximal atypical orbit closures in each stratum of translation surfaces $\Omega \mathcal{M}_g (\kappa)$, as given by Eskin, Filip, and Wright. We also describe a concrete algorithm, implementable in principle on a computer, which provably computes all maximal orbit closures which are 'atypical' in a sense described by Filip. The same methods also give a general algorithm for computing atypical special loci associated to systems of differential equations, and in particular give an effective and o-minimal free proof of the geometric Zilber-Pink conjecture for variations of mixed Hodge structures.

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Cited by 4 Pith papers

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  1. Algebraic Hodge generic points are dense

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    Hodge generic points of S over the algebraic numbers are analytically dense in S over the complex numbers for quasi-projective families of varieties.

  2. On the Chow ring of very general abelian varieties and a question of Pirola

    math.AG 2026-07 accept novelty 7.0 of 10

    On very general abelian varieties of dimension ≥4 (and genus-4 Jacobians), D^2 = 0 in CH^2 forces D torsion; consequently all rational sections of the genus-4 Kummer fibration are rational multiples of the Griffiths–P...

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  4. Unlikely intersections in Shimura varieties and beyond: a survey

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    A survey of unlikely intersections in pure Shimura varieties, covering Andre-Oort, Andre-Pink-Zannier, Zilber-Pink, and the Pila-Zannier strategy.

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