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A conditional construction of restricted isometries
Afonso S. Bandeira, Dustin G. Mixon, Joel Moreira · 2014-10-24 · via cs.IT updates on arXiv.org

We study the restricted isometry property of a matrix that is built from the discrete Fourier transform matrix by collecting rows indexed by quadratic residues. We find an $ε>0$ such that, conditioned on a folklore conjecture in number theory, this matrix satisfies the restricted isometry property with sparsity parameter $K=Ω(M^{1/2+ε})$, where $M$ is the number of rows.

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