Inv(M) = Inverse of matrix M

Inv(M) = Inverse of matrix M:

One way to invert a square n by n matrix M is to do a LU decomposition of matrix M and then do n LU back substitutions to solve for each column of the inverse. If one of the diagonal elements of U is zero, the matrix M is singular and cannot be inverted.

See: Matrix Inverse -- From MathWorld

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