The problem is that one-sided limits have subscripted symbols above `$a$`

. I tried adding a blank subscript to the 'ordinary' limit, but that didn't seem to even out spacing.

```
\underline{Theorem:} $\lim \limits_{x \to a^{}} f(x)
\Longleftrightarrow \lim \limits_{x \to a^{-}} f(x)
= \lim \limits_{x \to a^{+}} f(x)$
```

## Best Answer

Use

`\vphantom{+}`

to have the same height as the RHS.