## Abstract

In this paper we discuss metric theory associated with the affine (inhomogeneous) linear forms in the so called doubly metric settings within the classical and the mixed setups. We consider the system of affine forms given by q↦qX+α, where q∈Z^{m} (viewed as a row vector), X is an m×n real matrix and α∈R^{n}. The classical setting refers to the dist(qX+α,Z^{m}) to measure the closeness of the integer values of the system (X,α) to integers. The absolute value setting is obtained by replacing dist(qX+α,Z^{m}) with dist(qX+α,0); and the more general mixed settings are obtained by replacing dist(qX+α,Z^{m}) with dist(qX+α,Λ), where Λ is a subgroup of Z^{m}. We prove the Khintchine–Groshev and Jarník type theorems for the mixed affine forms and Jarník type theorem for the classical affine forms. We further prove that the sets of badly approximable affine forms, in both the classical and mixed settings, are hyperplane winning. The latter result, for the classical setting, answers a question raised by Kleinbock (1999).

Original language | English |
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Journal | Journal of Number Theory |

Volume | 213 |

Pages (from-to) | 67-100 |

Number of pages | 34 |

ISSN | 0022-314X |

DOIs | |

Publication status | Published - Aug 2020 |

## Keywords

- Hausdorff dimension
- Hausdorff measure
- Hyperplane winning
- Jarnik theorem
- Khintchine–Groshev theorem
- Schmidt game