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Vector equation

  1. Nov 21, 2009 #1
    vector equation [SOLVED]

    Hello, i'm trying to proof that
    ∇×(a × b) = a(∇ · b) − b(∇ · a) + (b · ∇)a − (a · ∇)b
    (where a & b are vectors)

    But I'm stuck...

    Probably because this isn't correct:

    ∇×(a × b) = a(∇b) - b(∇a) ?

    But i don't know why!

    Could somebody please help !
    Kind regards
     
    Last edited: Nov 21, 2009
  2. jcsd
  3. Nov 21, 2009 #2
    whoops, already get it !
     
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