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Rudin 3.48 cauchy product

  1. Jul 15, 2012 #1
    Rudin motivates this formula by multiplying two power series and then setting z = 1 and somehow obtaining the cauchy product formula. But I am not following how he does this at all. Can anyone help me understand this?
     
  2. jcsd
  3. Jul 15, 2012 #2
    Nevermind I figured it out!
     
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