This is a minor typesetting issue with the math plugin.

Here’s a screenshot of a line I wrote:

Notice the line break right before `).`

and after `b_2`

.

There should be no line break either before or after math, unless there is also whitespace.

Here’s the markdown version of that line:

```
In your example, $C_{a_1, a_2} = 2$ because there are 2 vertices that point to both $a_1$ and $a_2$ (namely $b_1$ and $b_2$).
```

I cannot demonstrate it here directly as math support is not enabled here.

This is reproducible both in Firefox and Chrome.