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Rank-r projection sparsification conjecture
Rank- $r$ projection sparsification conjecture. There exists a constant $C_r$ such that one can choose indices $i_1,\dots,i_N\in[m]$ with
Conjectureopenmatrix-sparsification operator-norm positive-semidefinite-matricesarXiv posted 2 days ago

Rank-r projection sparsification conjecture