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I have a problem with the subscript under a sum with dot, it changes the position of the subscript. Namely,

\documentclass[a4paper,12pt]{article}

\usepackage[english]{babel}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{amssymb}

\begin{document}
\begin{align}
 \dot{\sum}_{i \in I}
\end{align}
\end{document} 

places the subscript next to the sum instead of under it. Does anyone know how to fix this?

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Are you executing the command in inline or display-style math mode? –  Mico May 13 at 12:45
    
Added the complete document. It was in the align environment (so not inline). –  Vincent May 13 at 12:47
    
@Vincent: I added an answer, but I am not sure, if this is what you intended –  Christian Hupfer May 13 at 12:55
add comment

2 Answers 2

up vote 8 down vote accepted

Using an accent upon \sum makes it lose the nature of operator. You simply have to reinstate it:

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}

\newcommand{\dotsum}{\mathop{\dot\sum}}

\begin{document}
\[
 \dotsum_{i \in I}
 \sum_{i \in I}
\]
\end{document}

The \sum next to \dotsum is just for checking the alignment.

enter image description here

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add comment
\documentclass[a4paper,12pt]{article}

\usepackage[english]{babel}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{amssymb}

\begin{document}
 \begin{align}
  \sum\limits^{\text{\textbullet}}_{i \in I}
 \end{align}
\end{document} 

enter image description here

share|improve this answer
    
Thanks for your help. The dot above the sum is only a bit to high. –  Vincent May 13 at 12:57
    
@Vincent: I know, that is the feature of \dot. It could be replaced by \textbullet or something. But egreg's solution is better! –  Christian Hupfer May 13 at 12:58
add comment

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