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Homework Help: Linearity rules

  1. Nov 4, 2008 #1
    Does anyone have a straightforward link to linearity rules? My textbook is not very helpful and my prof never knows what he is talking about :(.
    I have a few "prove this is not linear" questions to do
    f(x)=(|x1|,|x2|)
    f(x)=(1,2)+3x
    f(x)=(0,1)

    I should know this, but i tend to forget the silly little things.
    :(
     
  2. jcsd
  3. Nov 4, 2008 #2
    Basically a function is linear if f(x+y) = f(x) + f(y)
     
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