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Matrix sparsification and the sparse null space problem (1008.1498v1)
Published 9 Aug 2010 in cs.CC and math.NA
Abstract: We revisit the matrix problems sparse null space and matrix sparsification, and show that they are equivalent. We then proceed to seek algorithms for these problems: We prove the hardness of approximation of these problems, and also give a powerful tool to extend algorithms and heuristics for sparse approximation theory to these problems.
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