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That is called the identity matrix.

For example,

(3,1,4)t x (1,1,1) = (3,1,4)t In this case (1,1,1) is the identity matrix.

Another example is

5 11 1 0 1 11

x =

4 3 0 1 4 3

(You will have to imagine the brackets around the matrices as I did not know how to draw them in.)

In this case 1 0 is the identity matrix.

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11y ago

What else can I help you with?