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This question already has an answer here:

I would like to write $\sum_i$ to be displayed as \displaystyle $\sum_i$ but at the size of $\sum_i$. How can I do that?

I could maybe use a subscript command, but that is not my question. My question is more generic about the display style within the text style at the size of the text style.

marked as duplicate by Mico math-mode Nov 26 '17 at 20:15

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Welcome to TEX.SE. You could see the related at the right of this page. Probabily canyou resolve your question. – Sebastiano Nov 26 '17 at 20:11
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Use \limits.

\documentclass{article}
\usepackage{mathtools}
\begin{document}
abc $\sum_i$ $\sum\limits_i$ def
\end{document}

limits

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