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When I do $ \sum_{k=1}^{K} $ I get this:

enter image description here

But I want to get this:

enter image description here

where i is above!

I am working in beamer.

Werner
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    Add \displaystyle to the beginning, since you must have invoked it with a $ or a \(. As in $\dislaystyle\sum_{k=1}^{K}$. Alternately, you can invoke it with \[\sum_{k=1}^{K}\] which will put it in display style on a line by itself. – Steven B. Segletes Feb 05 '14 at 16:42
  • You are right I am using $ ... $ to display Math equations ... do I have to add \displaystyle before begin{document} ? what \displaystyle does ? –  Feb 05 '14 at 16:43
  • I updated my comment to address my ambiguity. – Steven B. Segletes Feb 05 '14 at 16:46
  • excellent, It is working, can you please explain to me the difference between : $ ... $ and \[ ... \] ? or show me a reference article for help ? –  Feb 05 '14 at 16:51
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    If it's in an inline formula, type $\sum\limits_{k=1}^K$ – egreg Feb 05 '14 at 16:52
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    $...$ (which is functionally equivalent with \(...\)) places the math in "inline" text style, for times when you want to include the math as part of a sentence. \[...\] places math on a separate line in a less compacted display style. If you need the displaystyle equation numbered, you should use something like the equation environment. – Steven B. Segletes Feb 05 '14 at 16:53
  • excellent, now I make the difference between $..$, \[ ... \] and equation environment. Suppose that I am using the equation environment , How do I put a reference to an equation ? –  Feb 05 '14 at 17:02
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    If you want your comment directed at a specific person you have to put their name lead by and @ in your comment, such as @ALJIMohamed. Otherwise, it goes to the owner of the post (in this case you). To answer your follow up, you want to use \label{labelname} inside the equation environment and \ref{labelname} at other points in your document. It would behoove you to use this site's search feature for these things, as many of these answers will already cover your particular questions. – Steven B. Segletes Feb 05 '14 at 17:18

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