Remarks and Solutions for HW on page 33
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7. If you expand the power series, you will see that the radius of convergence
   is the following:

      1/R = limsup (1/n)^[1/n(n+1)] = 1.

   To take this limit use the usual techniques from calculus, i.e., let
   u = (1/n)^[1/n(n+1)]. Then take the log of both sides, etc.
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