Well, Google can help you. Here there are some links that may help you:

http://www.math.uiuc.edu/~hildebr/tex/theorems.html
http://www.emerson.emory.edu/services/latex/latex_21.html
http://en.wikibooks.org/wiki/LaTeX/Theorems

If you use the ntheorem package you may find some more info here: 
http://www.tug.org/teTeX/tetex-texmfdist/doc/latex/ntheorem/ntheorem.pdf

Nicolás

Nathan Russell wrote:
Hmm, I think it's interacting weirdly with some other stuff.  Also, I want
definitions to be numbered within chapters (and not within sections).

Is there a good general guide to numbering somewhere?

Thanks much again!

Nathan

On 6/12/07, Nicolás <[EMAIL PROTECTED]> wrote:

If I am not wrong, inserting the following line into your preamble should
do the trick:

\newtheorem{theorem}{Theorem}[chapter]

Cheers,
Nicolás

Nathan Russell wrote:
> Hi,
>
> I'm working on my thesis in lyx, it's a document of class book-AMS (so
that
> I can use theorem, definition... formats)
>
> I want both theorems and definitions to be numbered within each chapter,
> not
> section (so, for example, the fifth definition in chapter 3 is defintion
> 3.5).
>
>
> Is there a way to do this at all?
>
> Thanks much
> Nathan
>




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