Math & Science ⇒ Parentheses around a sigma sum with huge subscript

[hkyz]

Consider the the following expression:

Code: Select all

\begin{equation}
A = \left( \sum_{\substack{i<B\\i<C\\i<D}}{i} \right)
\end{equation}

When latex renders it, there is significant empty space above the sigma sum that is covered by the parentheses. Any ideas on how to reduce the vertical size of the parenthesis so that it does not cover the empty space above the sigma?

Manual parentheses don't work. The expression is simply too tall.

Best,

hkyz

[Stefan Kottwitz]

You could change the base line by \vcenter. Here we just enter mathmode again, within that box, and switch on display style:

Code: Select all

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
A = \left(\vcenter{\hbox{$\displaystyle\sum_{\substack{i<B\\i<C\\i<D}}{i}$}} \right)
\end{equation}
\end{document}

Sum with parentheses

sum.png (4.25 KiB) Viewed 5652 times

Stefan

[localghost]

Use manually adjusted delimiters.

Code: Select all

\documentclass[11pt]{article}
\usepackage[T1]{fontenc}
\usepackage{mathtools}

\begin{document}
  \begin{equation}
    A=\Bigl(\sum_{\substack{i<B\\i<C\\i<D}}{i}\Bigr)
  \end{equation}
\end{document}

Usually the limits aren't enclosed by the delimiters.


Thorsten

[hkyz]

Stefan's solution works well. Thanks a lot.