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How do I get LaTeX to put the infinity on top of the SUM symboL

  1. Aug 30, 2008 #1
    I need to make a power series in LaTex that looks like this
    [tex] u = \Sigma^{\infty}_{k=0} a_kx^k [/tex]

    But I wan the infinity on top of the sum and the k=0 on the bottom like normal setting out but I can't find out how to do it?
    Hopefully someone from here can show me! Thanks
     
  2. jcsd
  3. Aug 30, 2008 #2

    HallsofIvy

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    Use "sum" instead of "Sigma":

    [tex]u= \sum_{k=0}^\infty a_kx^k[/tex]
     
  4. Aug 30, 2008 #3
    thanks!
     
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