# Display style in text, but at text style size [duplicate]

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.

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Use \limits.
\documentclass{article}
abc $\sum_i$ $\sum\limits_i$ def