For almost every real number, there is another number such that their product is equal to one. For instance, the product of 5 and 1⁄5 is 1. Numbers such as these are called multiplicative inverses. The exception to this rule is the number zero. It has no multiplicative inverse since any product with zero is zero.
Matrices share this property. In this section you’ll learn about the identity matrix, a matrix that plays the role that the number 1 plays for multiplicative inverses. In addition, you’ll learn how to find the inverse of a matrix.
Read in Section 3.3
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