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2Â¥: Originally posted by wurongjun at 2015-06-21 22:16:21
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СÍõ´óÈË: ½ð±Ò+10, ¡ïÓаïÖú, л¡« 2015-06-22 17:42:42
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СÍõ´óÈË: ½ð±Ò+10, ¡ïÓаïÖú, л¡« 2015-06-22 17:42:02
Basic low-rank approximation problem
Seems have been very well studied.

https://en.wikipedia.org/wiki/Low-rank_approximation
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