| Definition: | for a regular square matrix A, square matrix A−1 such that: AA−1 = A−1A = E, where E is the unit matrix NOTE The inverse of a square matrix A = (Aij) is denoted by A−1 = (Aij)−1, with elements denoted by (A−1)ij. The notation (Aij−1) must not be used because it means the matrix constructed from inverse elements of A.
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