Matrices The Identity Matrix

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Matrices - The Identity Matrix

• The identity matrix of order 2 is given by ...

• The identity matrix of order 3 is given by ...

• Note that the identity matrix is formed by
  making each entry on the main diagonal of a
  square matrix equal to 1 ...

and all other entries are zeros.

• When the identity matrix is multiplied times
  any square matrix A of the same order, the result
  is matrix A.

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Matrices - The Identity Matrix

• Example 1
• Let matrix A be given by ...

Find the products AI and IA.
Slide 2
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Matrices - The Identity Matrix

• Example 2
• Let matrix B be given by ...

Find the product IB.
Slide 3
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Matrices - The Identity Matrix
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