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Invertible Matrices within a Matrix

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4 1 $begingroup$ Suppose A, B are invertible matrices of the same size. Show that $$M = begin{bmatrix} 0& A\ B& 0end{bmatrix}$$ is invertible. I don't understand how I could show this. I have learned about linear combinations and spanning in my college class, but I don't know how that would help in this case. linear-algebra matrices inverse block-matrices share | cite | improve this question edited 1 hour ago Martin Sleziak 44.8k 9 118 272 asked 3 hours ago Baile