TDSM 8.7

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[math](A^{-1})^{-1} = (A^{-1})^{-1} I = (A^{-1})^{-1} \left( A^{-1} A \right) = \left( (A^{-1})^{-1} A^{-1} \right) A = IA = A [/math]

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