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invertible
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An $n\times n$ matrix $A$ is invertible if there exists an $n\times n$ matrix $A^{-1}$ so that \[ A\cdot A^{-1}=I_n=A^{-1}\cdot A.\] The matrix $A^{-1}$ is called an inverse of $A$.
invertible.1456329814.txt.gz · Last modified: by rupert