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Questions about the properties of vector spaces and linear transformations, including linear systems in general.

3 votes
0 answers
131 views

Orthonormal basis with small $\ell_{\infty}$ norm for a subspace

(Note: I posted this question on stackexchange but was told it might be more suited for mathoverflow. There has been some discussion about the problem there.) Let $U \subset \mathbb{R}^n$ be a $d$-di …