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edited Apr 13, 2017 at 12:58

Finding this subset of columns is a non-trivial task, but some approximate answers are known. For details and pointers, please refer to my answer here.to my answer here.

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created Apr 26, 2013 at 17:24

Suvrit

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Finding this subset of columns is a non-trivial task, but some approximate answers are known. For details and pointers, please refer to my answer here.