Making a larger sum

Question

I have the following code, and the sum sign isn't tall enough, the fraction sticks out from the top and bottom, how do I correct this?

\documentclass[12pt]{article}
\usepackage[a4paper]{geometry}
\usepackage{amsmath}
\begin{document}
$$\sum_{k=n+1}^{\infty} \frac{1}{k!}$$
\end{document}

Thanks in advance.

Try using \[ \displaystyle\sum_{k=n+1}^{\infty} \frac{1}{k!} \]. — Levy, Feb 01 '19 at 15:59
Don't use $$...$$ for equations. https://tex.stackexchange.com/q/503 — samcarter_is_at_topanswers.xyz, Feb 01 '19 at 16:00
That's how the summation sign is expected to be. Don't worry. — egreg, Feb 01 '19 at 16:08
@Teepeemm yes it is! You code compiled properly here. I thought it could be of some help using that to archive what you needed. — Levy, Feb 01 '19 at 16:11
the normal setting is what you show, summation is a stylised sigma and isn't normally stretched to be the same height as the summands. — David Carlisle, Feb 01 '19 at 16:30

score 6 · Answer 1 · answered Feb 01 '19 at 16:18

You may try with the relsize package:

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

\begin{document}

\[ \sum_{k=n+1}^{\infty} \frac{1}{k!} \]
\[ \mathlarger{\sum}_{k=n+1}^{\infty} \frac{1}{k!} \]

\end{document}

Mico · Answer 2 · 2019-02-01T20:38:06.843

Various packages let you draw larger-than-normal \sum (and \prod and \int and ...) symbols. Here are the choices offered by the mtpro2 math font package. The red one is produced by \sum in display-style math mode. (Aside: The full mtpro2 package is not free of charge; however, it's lite subset -- which is all that's needed to create the following screenshot -- is indeed free. It can be downloaded from this site.

That said, it would be extremely unusual, to put it mildly, to ever require anything larger than \xl\sum. Speaking for myself, the symbols drawn by \XL\sum, \XXL\sum, and \XXXL\sum are beyond any conceivable (but still legitimate) typographic need.

\documentclass{article}
\usepackage{xcolor}
\usepackage[lite]{mtpro2}
\begin{document}
$\vcenter{\hbox{$\Sigma$}}           % just for reference
 \sum                                % appearance in text-style (inline) math mode
 \displaystyle \textcolor{red}{\sum} % appearance in display-style math mode
 \xl\sum 
 \XL\sum \XXL\sum \XXXL\sum$
\end{document}

Making a larger sum

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