Maximal Hausdorff dimension conjecture for badly approximable complex matrices

Let m,nm,n be positive integers, let BadC(m,n)Cmn\textbf{Bad}_{\mathbb{C}}(m,n)\subset\mathbb{C}^{mn} denote the set of badly approximable points, and let KCmnK\subset\mathbb{C}^{mn} be any compact subset. The Hausdorff dimension is denoted by dim\dim. Maximal-dimension conjecture.

dim(BadC(m,n)K)=dimK.\dim\bigl(\textbf{Bad}_{\mathbb{C}}(m,n)\cap K\bigr)=\dim K.

This conjectures that badly approximable points have full Hausdorff dimension inside every compact subset of the ambient complex matrix space. The cited framework establishes analogous maximal-dimension results for certain weighted simultaneous-approximation settings, but the source states that it does not apply to the dual setup considered here.

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Primary source

Seyyed Hassan Mahboubi, Mumtaz Hussain, Abolfazl Seyed Motahari and Amir Keyvan Khandani, “Layered Interference Alignment: Achieving the Total DoF of MIMO X Channels”, arXiv:1412.7188 (2014).

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