10

enter image description here

\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 ''.

1
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    – Werner
    Dec 4, 2011 at 16:02

2 Answers 2

8

Just use

\sum_{k=0}^{n}{}'' f(x_{k})
5
  • thx :) I would have never guessed {}''
    – waszak
    Dec 4, 2011 at 12:27
  • it's just that you now are double-priming the {}- but think about the notation, it is a bit nonstandard Dec 4, 2011 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, 2011 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 Dec 4, 2011 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. Dec 5, 2011 at 9:39
17

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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