English

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 WW of a power of the multiplicative group, concerning the intersections of WW with translates of a subtorus HH of dimension greater than or equal to the codimension of WW. The first one is that every translate of HH intersects WW, unless HH is contained in one of finitely many proper subtori depending only on WW. The second one is that every translate of HH by a torsion point intersects WW, unless the translate is contained in one of finitely many proper algebraic subgroups, again depending only on WW. We use methods from tropical geometry and equidistribution, as well as some very mild model theory.

Keywords

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

R2 v1 2026-07-01T03:06:39.401Z