Identity matrix - Matrices

Identity matrix

Lessons

Notes:
An identity matrix is an nn by nn matrix (written as InI_n) where all the entries that is diagonal from the top left to the bottom right are all 1’s, and the rest of the entries are 0. For example,



are all identity matrices.
    • a)
      The Identity Matrix
    • b)
      Multiplicative Inverses
  • 2.
    Matrix Operation with the Identity Matrix
    You are given that and . Perform the following matrix operations:
  • 3.
    Multiplicative Inverses
    Are the following matrices multiplicative inverses of each other?
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Identity matrix

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