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Showing differentiability in R^n

  1. Sep 21, 2006 #1
    When you are given a function and asked for differentiability at a point in domain or the whole domain, what's the normal procedure? I think the definition is almost useless in here...
    Also, I'm still stuck on the previous questions so if anyone bothers to check them out...
     
  2. jcsd
  3. Sep 21, 2006 #2

    AKG

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    The definition is entirely useful, and the previous question has already been answered.
     
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