I have an equation that uses (\varphi) which I'd like to define with a text, like the following (hardcoded) example:

The "traditional" way would be to do this in the surrounding text:

```
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\textbf{Textbased}
Blabla where $\varphi$ is \texttt{definition}
\begin{equation}
\varphi = 1337
\end{equation}
\end{document}
```

Now, doing a simple `\text{def}`

would work, however this affects the alignment, as the equation is centered around the *total* equation, which includes the `\text{def}`

. Furthermore, the definition is not right-aligned as desired:

```
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\textbf{Quadbased}
\begin{equation}
\varphi = 1337 \qquad \text{defs}
\end{equation}
\end{document}
```

Another option is listing a tag. This does what I desire, which is to define some variable to the side of the main equation. However, its main problem is that it actually replaces the equation number like so:

```
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\textbf{Tagbased}
\begin{equation}
\varphi = 1337 \tag*{defs}
\end{equation}
\end{document}
```

Anyone that has a solution?

## Best Answer

Welcome! You could use

`\newtagform`

from`mathtools`

.As illustrated, with

`\usetagform{default}`

you can switch back to the default tag form.