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Let A be an m x n matrix. Prove that the null-space of AT A, Null...

Let A be an m x n matrix. Prove that the null-space of AT A, Null (AT A), is a subspace of Rn.

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7及 η4// Spece.cr//fce m9tr/x. A, c/e nefea/ 92/ q12 923..-.tq2η solyron set of a The null spocen sysfem g the co eirent maticlain l、-Null ( A)c/a/ m2- NM//M.リ .) TRE 18 a subseere p,

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