## Quick Reference

For a given *n*×*n* matrix of numbers, *A*, if there is an *n*×*n* matrix *B* for which *AB* = *BA* = *I* where *I* denotes the identity matrix, then *B* is the inverse matrix of *A* and *A* is said to be invertible with *B*. If it exists, *B* is unique and is denoted by *A*^{−1}.

*AB* = *BA* = *I*

*Subjects:*
Mathematics.

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