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Help with an equality

  1. Nov 10, 2007 #1
    Hello.

    I can't figure out why the equality in the attached file is true.
    Please, could you help me?

    Thank you.
    SNES
     

    Attached Files:

    • eqn.jpg
      eqn.jpg
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  2. jcsd
  3. Nov 10, 2007 #2

    EnumaElish

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    In general it's not. What is the context?
     
  4. Nov 10, 2007 #3
    Convolution?
     
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