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Latex fraction help!

  1. May 29, 2010 #1
    Hello, I need write this equation and here's the code:

    \begin {displaymath}
    \[
    \frac{\sum_{s_i \in S_{access}^{site}}{{e^{-\beta E(s_i)}}}}{Q}
    \]
    \end {displaymath}

    It is working well, the only problem being that the sum ''subscript'' is not directily underneath the sum symbol, but rather to the side of it (probably because it's too long). I was wondering if you could help me.

    Thanks.
     
  2. jcsd
  3. May 29, 2010 #2
    $\displaystyle\sum_{i=0}$

    works
     
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