# Adding space in LaTeX maths expressions

So this is a simple one which is used everywhere. Essentially I was trying to express some run times in LaTeX using the following:

```
O(n log(n))
```

However, this displayed as:

```
O(nlog(n))
```

The solution is to add some horizontal space using real units as follows:

```
O(n\hspace{2 mm}log(n))
```

I found 2mm to be about right when using `pdflatex`

, but feel free to play with it your self.