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\sum_{k=0}^{n} f(x_{k})

I want to change sth in this code to get sth like this image. I have problem where put ''.

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migrated from stackoverflow.com Dec 4 '11 at 15:06

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2 Answers 2

up vote 8 down vote accepted

Just use

\sum_{k=0}^{n}{}'' f(x_{k})
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thx :) I would have never guessed {}'' –  waszak Dec 4 '11 at 12:27
    
it's just that you now are double-priming the {}- but think about the notation, it is a bit nonstandard –  epsilonhalbe Dec 4 '11 at 12:31
2  
With your method, the "double prime" symbols tend to be a bit too low. It's much better to use the command \sideset (see the other answer) for this reason. That said, your code reproduces the image that the OP posted exactly... :-) –  Mico Dec 4 '11 at 16:38
    
really i - knew about \sideset - but i clearly forgot about it, in this case - the only thing i find a bit awkward is the space between the n and the \sum-symbol –  epsilonhalbe Dec 4 '11 at 17:56
    
@epsilonhalbe: This space is due to the possibility that the upper limit might exceed the width of the sum operator and thus overwrite the added marker. –  Thorsten Donig Dec 5 '11 at 9:39

The \sideset command from the amsmath package is probably more suitable.

\documentclass{article}
\usepackage{mathtools}   % loads »amsmath«

\begin{document}
  \[
    \sideset{}{''}\sum_{k=0}^{n} f(x_{k})
  \]
\end{document}
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