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Eigenvalues again

  1. Mar 4, 2006 #1
    In my textbook recently I stumbled across the following:

    Give a general description of those matrices which have two real eigenvalues equal in 'size' but opposite in sign? Could anyone explain this again very simply :-)
     
  2. jcsd
  3. Mar 4, 2006 #2

    0rthodontist

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    What's to explain? They want you to describe the matrices that have two real eigenvalues of equal magnitude and opposite sign, such as 4 and -4.
     
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