So, I'm writing my thesis using the `book` class. I have the following:

```
[Chapter I The fundamentals]

```

using 

```
\chapter{The fundamentals}

```

together with

```
\renewcommand{\thechapter}{\Roman{chapter}}

```

Now, when I define the first section using

```
\section{LIBOR interest rates}

```

I get

```
[I.1 LIBOR interest rates]

```

What I want is for the chapter number to be left out of section numbering. What I want is

```
[1 LIBOR interest rates]

```

Any ideas on how to achieve this?