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Let's say that A and B are two nxn matrices (square matrices) and let In be the identity nxn
matrix for multiplication. We say that B is the inverse of A if AxB=In and BxA=In. In other words,
B is the inverse of A if their product equals the identity matrix. In this video I show you how to
calculate the inverse of a square matrix, if it exists. If the matrix has an inverse, it is called
non-singular. If it doesn't, it is called singular.