Simultaneous Diophantine approximation on affine subspaces and Dirichlet improvability

We show that affine coordinate subspaces of dimension at least two in Euclidean
space are of Khintchine type for divergence. For affine coordinate subspaces of dimension
one, we prove a result which depends on the dual Diophantine type of the base point of
the subspace. These results provide evidence for the conjecture that all affine subspaces of
Euclidean space are of Khintchine type for divergence. We also prove a partial analogue regarding the Hausdorff measure theory.

Furthermore, we obtain various results relating weighted Diophantine approximation and Dirichlet improvability. In particular, we show that weighted badly approximable vectors are weighted Dirichlet improvable, thus generalising a result by Davenport and Schmidt. We also provide a relation between non-singularity and twisted inhomogeneous approximation. This extends a result of Shapira to the weighted case.