# Ampersand, &, inside a theorem?

When I try to write the symbol "&" inside a theorem it looks different than I want it to. Is there a way to get the symbol inside the theorem? Here is what I get:

Here is the code:

\documentclass[a4paper]{memoir}
\usepackage{amsmath}
\usepackage{amsthm}
\newtheorem{theo}{Theorem}

\begin{document}
Outside theorem \&
\begin{theo}
Inside theorem \&

Inside theorem 2 \text{\&}
\end{theo}
\end{document}


Do you see how to fix this?

• Theorems are italic by default. You could use {\normalfont \&} in these cases as described in this answer. – epR8GaYuh May 2 '17 at 9:48
• You can also try \textup{\&} and \textsl{\&} – StefanH May 2 '17 at 9:49
• Can you show a “real world” example of usage, please? – egreg May 2 '17 at 13:37
• @egreg Inside a proof referring to and article written by two mathematicians. The article uses "&" instead of "and" between the names. – user119615 May 2 '17 at 14:33
• Use “and” instead, they're not a business company. ;-) – egreg May 2 '17 at 14:40

The suggestions in the comments work, but it sounds to me like you still want a properly italic ampersand, just not in that design. There are two solutions to this:

1. Use a different font altogether. Tgtermes is close to computer modern (the default tex font), but gives you the ampersands that you want.

\documentclass[a4paper]{memoir}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{tgtermes}
\newtheorem{theo}{Theorem}

\begin{document}
Outside theorem \&
\begin{theo}
Inside theorem \&

Inside theorem 2 \&
\end{theo}

\end{document}

2. Borrow an individual character from another font. See e.g. Font substitution with XeLaTeX

• Inside a list you need to indent code blocks by eight instead of four spaces – clemens May 2 '17 at 13:24
• Package tgtermes gives you the font Computer Modern in math mode, but the font Times in text mode, hence the different (Times) ampersand. – Rosie F May 29 '17 at 8:00