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Tensor problems please help

  1. Apr 27, 2012 #1
    1. find ∂r/∂x[itex]_{j}[/itex], where r=|[itex]\underline{x}[/itex]|

    2. is this the same as differentiating a modulus of a vector?
  2. jcsd
  3. Apr 27, 2012 #2


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    Try writing r out in components, i.e. r = f(x1,x2,x3,...) and I think it will be obvious what you need to do.
  4. Apr 27, 2012 #3
    thats what i dunno... what is the component for a mod x?
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