Which of the following are subspaces of Mi?? Support your answer. (a) (b) U = {A |

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Which of the following are subspaces of Mi?? Support your answer.
(a)
Which of the following are subspaces of Mi?? Support your

(b) U = {A | A in M22, AB = 0}, B a fixed 2 × 2 matrix
(c) U = {A | A in M22, A is not invertible}

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