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What is this symbol?

  1. May 25, 2009 #1
    1. The problem statement, all variables and given/known data
    http://img40.imageshack.us/img40/6421/57065635.jpg [Broken]
    3. The attempt at a solution
    I just what to know what the hollow I symbol is?
    Is it just
    1 0 0
    0 1 0
    0 0 1
    Thank you!
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 25, 2009 #2
    Yes, it is the identity matrix.
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