If A is an nn matrix with the property that Ax = 0 for all x Rn, show that A = O. [Hint
Chapter 1, Problem 20(choose chapter or problem)
If A is an nn matrix with the property that Ax = 0 for all x Rn, show that A = O. [Hint: Let x = ej for j = 1, . . . , n.] 2
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