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Power series of a scalar function with a vector

  1. Sep 29, 2008 #1
    I was trying to expand a scalar function with a power series but it accepts a vector argument. Do I simply use the multivariable power series expansion with the components of the vector acting as the argument OR do I use the single variable power series and take the vector's magnitude in the expansion?
     
  2. jcsd
  3. Sep 29, 2008 #2

    Dick

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    You can only expand as a series in the vector's magnitude if the scalar function is only a function of the vector's magnitude (that's it's spherically symmetric). Is it? If not then you need the multivariable power series.
     
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