# Unnumbered line inside align

Basically, I have two equations that I wanted to use align to number, but I also wanted to put the word 'and' in between the lines. Here's what I have so far

\begin{document}
\usepackage{amsmath}

\begin{align}
\mathrm{distance} &= \mathrm{speed} \times \mathrm{time}\\
&\text{and}\\
y &= \mathrm{m}x + \mathrm{c}
\end{align}

\end{document}


This gives me the equations in the way that I want them but it numbers the line that says 'and'. Hopefully, if this made any sense, someone can help me with this.

• There is \nonumber/\notag but here, typographically speaking, you should use \intertext{and} or \shortintertext{and} from the mathtools package instead (you can slip a \centering in there). – Qrrbrbirlbel Apr 28 '13 at 18:27
• Ah okay, cool, thanks. Looking at it now, I'm fairly sure I've used this before, I knew it wasn't difficult. Thanks again! – bigbadpiano Apr 28 '13 at 18:31

\documentclass[preview,border=12pt]{standalone}% please change to your document class
\usepackage{mathtools}
\usepackage{amsthm}
\newtheorem{mydef}{Definition}

\begin{document}
\begin{mydef}
\begin{align}
\text{distance} &= \text{speed} \times \text{time}\\
\intertext{and}
y &= \mathrm{m}x + \mathrm{c}
\end{align}
\end{mydef}

\begin{mydef}
\begin{align}
\mathrm{distance} &= \mathrm{speed} \times \mathrm{time}\\
\shortintertext{and}
y &= \mathrm{m}x + \mathrm{c}
\end{align}
\end{mydef}

\end{document}


## Remarks:

Compare the results in the first and the second theorems carefully.

• Use \text when you want its content to be affected by the surrounding font. For example, if \text is used inside a theorem environment, the surrounding font is italic so the contents of \text will be in italic as well.

• Use \mathrm when you don't want its contents to be affected by the surrounding font.

• Use \intertext for getting normal spacing but \shortintertext for shorter one.
• Oh right, okay, cheers. I'm kinda just getting used to this trying to write my first lab report for uni with it. This is really great, I didn't really understand what \mathrm was I was just using it. Thanks again, really helpful! – bigbadpiano Apr 28 '13 at 18:51
• Use \centering inside the intertext commands for a more readable centred layout, e.g., \shortintertext{\centering and}. – loved.by.Jesus Feb 21 '19 at 16:10
\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{align}
\mathrm{distance} &= \mathrm{speed} \times \mathrm{time}\\
\noalign{\text{and}}
y &= \mathrm{m}x + \mathrm{c}
\end{align}

\end{document}


• Oh wow, that was so simple. I feel pretty stupid now. I knew there would be some simple fix! Thank you! – bigbadpiano Apr 28 '13 at 18:27