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Homework Help: Lenght Of Vector

  1. Oct 2, 2005 #1
    what constraints must the elements of three dimensional rotation matrix satisfy in order to preserve length of vector A
     
  2. jcsd
  3. Oct 2, 2005 #2

    robphy

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    Here's a start:
    your question expressed symbolically...
    [tex]{\vec A'}^\top\vec A'=(R\vec A)^\top(R\vec A)=\vec A^\top\vec A[/tex]

    So, what must [tex]R[/tex] satisfy? Can you do matrix algebra?
     
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