# Section numbering with chapter in amsbook

I'm using `amsbook` to write a report. I'm using `\chapter{}`s and `\section{}`s, and their numbering is fine. However, `\section{}`s are numbered sequentially inside each `\chapter{}`, but without the indication of the `\chapter{}`: basically, I'm getting `Section 1` instead of `1.1`, and similarly `Subsection 1` instead of `1.1.1`.

How do I go about fixing this?

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Write the following in the preamble:

``````\renewcommand{\thesection}{\thechapter.\arabic{section}}
``````
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Thanks, that did it (even for subsections)! –  Anto Jun 15 '11 at 15:25
Instead of posting a “Thank you” as a comment, you should thank by upvoting the answer (with the upward pointing arrow to the left of it) and accepting it (by clicking on the checkmark). –  egreg Jun 15 '11 at 15:31

alternate approach: in the preamble,

``````\numberwithin{section}{chapter}
``````

but it doesn't carry along to subsections; for that you'd need

``````\numberwithin{subsection}{section}
``````

etc.

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