Position of subscript associated with summation symbol

Question

To conserve space, I wish to generate

$\sum_{i \in B}$

However, when I put the Latex code into \begin{equation}, using

\begin{equation}
    \sum_{i \in B}
\end{equation}

it becomes

No. Just no.

Can someone please help to make the subscript more like the top one. Thanks!

Answer 1

Use amsmath with the nosumlimits option.

\documentclass{article}
\usepackage[nosumlimits]{amsmath}

\begin{document}

\begin{equation}
\sum_{a\in A}\prod_{b\in B}
\bigcap_{c\in C}
\end{equation}

\end{document}