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Linear algebra

  1. Nov 25, 2008 #1
    1. The problem statement, all variables and given/known data

    Hey guys.
    Can anyone help with proving this equality please?
    I don't have a clue.

    10x.

    2. Relevant equations



    3. The attempt at a solution
     

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  3. Nov 25, 2008 #2

    HallsofIvy

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    First V is not contained in C, V is a vector space over the complex numbers.

    Now, presumably you know that ||v||2= <v, v>.

    Expand ||u+ v||, ||u- v||, ||u+ iv||, and ||u- iv|| and see what you get.
     
  4. Nov 25, 2008 #3
    Thanks.
     
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