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How can I typeset a big summation with index next to it (like that one in the photo below) instead of an index in the bottom ?! . I need help please :) .

enter image description here

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  • This yields a small summation not a big one . Besides, I use align environment.
    – Hussein Eid
    Nov 7, 2016 at 18:41
  • \sum\nolimits_{n}
    – egreg
    Nov 7, 2016 at 18:43
  • although this is most peculiar, it can be obtained by \displaystyle]sum\nolimits_n
    – barbara beeton
    Nov 7, 2016 at 18:45
  • I am deleting my earlier comment, since I misunderstood and provided a misleading comment.
    – Steven B. Segletes
    Nov 7, 2016 at 18:46

2 Answers 2

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The place (above/below or right) for the indices of large operators can be set explicitly using \limits or \nolimits:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
E &= \sum\nolimits_n f(x) \\
E &= 42
\end{align}
\end{document}

Result

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\documentclass{article}
\begin{document}
$\displaystyle E=\sum\nolimits_n{f(x)}$
\end{document}

enter image description here

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1
  • 2
    This yields a small summation not a big one . Besides, I use align environment.
    – Hussein Eid
    Nov 7, 2016 at 18:41

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