Question: Let A denote an m n matrix. (a) Show that null A = null(UA) for every invertible m m matrix U. (b) Show

Let A denote an m × n matrix.
(a) Show that null A = null(UA) for every invertible m × m matrix U.
(b) Show that dim(null A) = dim(null (AV)) for every invertible n × n matrix V.

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b Note first that each V 1 xi is in nullAV because AV V 1 x i Ax i 0 If t 1 V 1 x 1 t k V 1 x k ... View full answer

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