Maximal Hausdorff dimension conjecture for badly approximable complex matrices

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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 K⊂CmnK\subset\mathbb{C}^{mn} be any compact subset. The Hausdorff dimension is denoted by dim⁡\dim. Maximal-dimension conjecture.

dim⁡(BadC(m,n)∩K)=dim⁡K.\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.

References

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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