A Local-Global Equality on Every Affine Variety Admitting Points in an   Arbitrary Rank-One Subgroup of a Global Function Field
  For every affine variety over a global function field, we show that the set of its points with coordinates in an arbitrary rank-one multiplicative subgroup of this function field is topologically dense in the set of its points with coordinates in the topological closure of this subgroup in the product of the multiplicative group of those local completions of this function field over all but finitely many places. 
Chia-Liang Sun
math.NT