Matrix Inverse -- from Wolfram MathWorld
mathworld.wolfram.com/MatrixInverse.html17.12.2021 · A matrix possessing an inverse is called nonsingular , or invertible. The matrix inverse of a square matrix may be taken in the Wolfram Language using the function Inverse [ m ]. A general matrix can be inverted using methods such as the Gauss-Jordan elimination , Gaussian elimination, or LU decomposition .