Likely intersections in powers of the multiplicative group
Number Theory
2025-06-23 v2 Algebraic Geometry
Logic
Abstract
We derive two finiteness properties as consequences of the geometrical non-degeneracy of an algebraic subvariety of a power of the multiplicative group, concerning the intersections of with translates of a subtorus of dimension greater than or equal to the codimension of . The first one is that every translate of intersects , unless is contained in one of finitely many proper subtori depending only on . The second one is that every translate of by a torsion point intersects , unless the translate is contained in one of finitely many proper algebraic subgroups, again depending only on . We use methods from tropical geometry and equidistribution, as well as some very mild model theory.
Cite
@article{arxiv.2506.07550,
title = {Likely intersections in powers of the multiplicative group},
author = {Gabriel Andreas Dill and Francesco Gallinaro},
journal= {arXiv preprint arXiv:2506.07550},
year = {2025}
}
Comments
42 pages, comments are very welcome