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  3. id like the step by step proof of this problem...

Question: id like the step by step proof of this problem...

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Suppose A is a square matrix with entries in a field F partitioned as where X and Z are square matrices and 0 1s a zero matrix. (a) Find necessary and sufficient conditions on X, Y, and Z so that A is invertible and then find formulas for P, Q, R, and S so that A-i is the block matrix OC P Q R S

I'd like the step by step proof of this problem.

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